Common use of Number Clause in Contracts

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------------ ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------------ ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-S12 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022003-AR17S12, Class [__] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-S12 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022003-AR17S12, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- -------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- -------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AI Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR18, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AI Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR18, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------- ------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-AR1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17AR1, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-AR1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] AR1 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS12 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS12, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS12 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS12, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- ------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S6 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17S6, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S6 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17S6, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS3 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS3, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS3 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS3, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇street address, ▇▇▇▇city, ▇▇▇▇▇state, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee One Federal Street, Third Floor Boston, MA 02110 Attn: Corp▇▇▇▇▇ ▇▇▇▇▇ ▇▇. ▇▇▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH ▇▇▇▇-▇A1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022004-AR17RA1, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa AnaOne Federal Street, CA 92705 Third Floor Boston, MA 02110 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇Corp▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase ▇▇▇▇-▇A1 Washington Mutual Mortgage Securities Corp. WaMu 75 N. Fairway Drive Vernon Hills, Illinois 60061 The unde▇▇▇▇▇▇▇ (▇▇▇ "▇▇▇▇▇▇▇▇▇") ▇▇▇▇▇▇▇▇ ▇▇ ▇▇▇▇▇▇▇▇ ▇▇shington Mutual MSC Mortgage Pass-Through Certificates, Series 20022004-AR17RA1, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- --------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- --------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------- -------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- --------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------- -------------------------- Signature of authorized representative Date Exhibit Echibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-S13 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022003-AR17S13, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-S13 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022003-AR17S13, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS10 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS10, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS10 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS10, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ------------------------------------------------ ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ------------------------------------------------ ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2002-AR3 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17AR3, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2002-AR3 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17AR3, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS6 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS6, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS6 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS6, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------ -------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------ -------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A3 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR3, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A3 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR3, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S10 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17S10, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S10 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] S10 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A9 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR9, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A9 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR9, Class [_____] (the "Purchased Certificates") in the principal amount of $_$ _____________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ---------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------- ---------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S2 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17S2, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S2 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17S2, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS14 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022001-AR17MS14, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS14 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] MS14 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-6 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR176, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- -------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-6 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] 6 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- -------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. AGREED TO AND ACCEPTED BY WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S8 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17S8, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S8 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] S8 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A6 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR6, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A6 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR6, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A6 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17AR6, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- -------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A6 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] AR6 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------------- ----------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------------- ----------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AD Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR13, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AD Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR13, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- 128 ---------------------------------------------------------------- Principal place of business: ▇▇st▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ---------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------- ------------------ Signature of the Company's authorized Date officer Date Agreed to and accepted by Washington Mutual PNC Mortgage Securities Corp. -------------------------------------------------------------------------------- ------------------------------------------------------------ Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------- --------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇22▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 Attn▇▇ ▇▇▇▇▇ ▇ttn: Corporate Trust Administration WA02AH Department, PNC 2000-5 Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Pass- Through Certificates Series 20022000-AR175, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration 129 requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇22▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 Attn▇▇ ▇▇▇▇▇ ▇ttn: Corporate Trust Administration WA02AH Washington Mutual Department, PNC 2000-5 PNC Mortgage Securities Corp. ▇▇ 75 ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Class [ ] Certificates evidencing an undivided interest in PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022000-AR17, Class [_____] 5 (the "Purchased Certificates") in the principal amount of $______________----------. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of businessTrade and Other Names: Hamco Industries Tufco Division Limited Partnership United States Federal Income Tax I.D. Number: 75-2▇▇▇▇▇▇ ▇▇▇▇▇▇▇Schedule 3.3, ▇▇▇▇Solo Page 129 SCHEDULE 3.4 TO SECURITY AGREEMENT Intellectual Property COPYRIGHTS AND COPYRIGHT LICENSES None PATENTS AND PATENT LICENSES None ================================================================================================================================= TRADEMARKS ================================================================================================================================= Country of Application or Filing Expiration Owner of Record Registration Trademark Registration No. Date Date Goods ================================================================================================================================= Tufco, ▇▇▇▇▇L.P., zip code -------------------------------------------------------------------------------- Typed name U.S. HAMCO (stylized letters) 1,703,259 7/28/92 papers and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to ink for d/b/a Hamco Industries business machines --------------------------------------------------------------------------------------------------------------------------------- Tufco, L.P., U.S. HAMCO (and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F design) 1,375,847 12/17/85 business machine d/b/a Hamco Industries paper ================================================================================================================================= TRADEMARK LICENSES None Schedule 3.4, Intellectual Property, Solo Page 130 EXHIBIT A TO SECURITY AGREEMENT FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust CompanyAMENDMENT This Amendment, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $dated _______________, 19___, is delivered pursuant to Section 4.8 of the Security Agreement (as herein defined) referred to below. In doing soThe undersigned hereby agrees that this Amendment may be attached to the Security Agreement dated as of August 28, 1998, between the undersigned and First Union National Bank, as agent for the ratable benefit of the Banks referred to therein (the "Security Agreement"), and that the shares of stock, membership interests, notes or other instruments listed on Schedule 1 annexed hereto shall be and become part of the Collateral referred to in the Security Agreement and shall secure payment and performance of all Obligations as provided in the Security Agreement. Capitalized terms used herein but not defined herein shall have the meanings therefor provided in the Security Agreement. TUFCO, L.P. By: Tufco Tech, Inc., its general partner By: ---------------------------- Name: -------------------------- Title: ------------------------- Stock Number Percentage of Stock Issuer Class of Stock Certificate No(s). Par Value of Shares Outstanding Shares ------------ -------------- ------------------ --------- --------- ------------------ Schedule 1 to Security Agreement Amendment, Solo Page 132 EXHIBIT "E" TO TUFCO, L.P. CREDIT AGREEMENT Guarantor Security Agreement EXHIBIT "E", Cover Page 133 GUARANTOR SECURITY AGREEMENT THIS GUARANTOR SECURITY AGREEMENT (the "Agreement") dated as of August 28, 1998, is by and among the undersigned, any party who may become a party hereto pursuant to the execution and delivery of a Joinder Agreement (each a"Debtor" and collectively the "Debtors") and FIRST UNION NATIONAL BANK (the "Secured Party"), as agent for the Banks, as that term is defined below. R E C I T A L S: TUFCO, L.P. is entering into that certain Credit Agreement dated of even date herewith with Tufco Technology, Inc., the Purchaser hereby acknowledges banks party thereto (each individually a "Bank" and agrees collectively, the "Banks") and the Secured Party, as follows:agent for the Banks (such agreement, as it may be amended or otherwise modified from time to time, herein the "Credit Agreement"). The execution and delivery of this Agreement is a condition to the Secured Party's and the Banks' entering into the Credit Agreement and making the extensions of credit thereunder.

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS11 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022001-AR17MS11, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS11 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] MS11 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------------- ------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------------- ------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AF Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR15, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AF Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR15, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual PNC Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------- Signature of authorized representative Date [RESERVED] Exhibit F G [RESERVED] Exhibit H FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE ADDITIONAL MATTER INCORPORATED INTO THE FORM OF THE CERTIFICATES [Date] Deutsche (OTHER THAN THE CLASS R-1 CERTIFICATES) This Certificate does not represent an obligation of or interest in PNC Mortgage Securities Corp. or any of its affiliates, including PNC Bank National Corp. Neither this Certificate nor the underlying Mortgage Loans are guaranteed by any agency or instrumentality of the United States. This certifies that the above-named Registered Owner is the registered owner of certain interests in a trust fund (the "REMIC II Trust Fund") whose assets consist of interests in a trust fund (the "Trust Fund") whose assets consist of, among other things, a pool (the "Mortgage Pool") of conventional one- to four-family mortgage loans (the "Mortgage Loans"), formed and administered by PNC Mortgage Securities Corp. (the "Company"), which term includes any successor entity under the Pooling Agreement referred to below. The Mortgage Pool was created pursuant to a Pooling and Servicing Agreement, dated as of the Cut-Off Date stated above (the "Pooling Agreement"), between the Company and State Street Bank and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "CertificatesTrustee") Ladies and Gentlemen: In connection with our disposition ), a summary of certain of the above Certificates we certify that (a) we understand pertinent provisions of which is set forth hereafter. To the Certificates extent not defined herein, the capitalized terms used herein have the meanings assigned in the Pooling Agreement. Nothing herein shall be deemed inconsistent with such meanings, and in the event of any conflict between the Pooling Agreement and the terms of this Certificate, the Pooling Agreement shall control. This Certificate is issued under and is subject to the terms, provisions and conditions of the Pooling Agreement, to which Pooling Agreement the Holder of this Certificate, by virtue of the acceptance hereof, assents and by which such Holder is bound. Distributions will be made, pursuant to the Pooling Agreement, on the 25th day of each month or, if such 25th day is not been registered under a Business Day, the Securities Act of 1933, as amended Business Day immediately following (the "ActDistribution Date"), commencing on the first Distribution Date specified above, to the Person in whose name this Certificate is registered at the close of business on the last day (or if such last day is not a Business Day, the Business Day immediately preceding such last day) and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation month immediately preceding the month of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned such distribution (the "PurchaserRecord Date") proposes ), to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") extent of such Certificateholder's Percentage Interest represented by this Certificate in the principal amount portion of $______________the REMIC II Available Distribution Amount for such Distribution Date then distributable on the Certificates of this Class, as specified in Section 4.04 of the Pooling Agreement. In doing soDistributions on this Certificate will be made by the Trustee by wire transfer or check mailed to the address of the Person entitled thereto, as such name and address shall appear on the Certificate Register. Notwithstanding the above, the Purchaser final distribution on this Certificate will be made after due notice by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate to the Certificate Registrar. Reference is hereby acknowledges and agrees made to the further provisions of this Certificate set forth below, which further provisions shall for all purposes have the same effect as follows:if set forth at this place. Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee, by manual signature, this Certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose.

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- -------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- -------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------- ---------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- AGREED TO AND ACCEPTED BY PNC MORTGAGE SECURITIES CORP. -------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------- --------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 Attn: Trust Administration WA02AH ▇▇ ▇▇▇▇▇ Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20021998-AR1711, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇Company ▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:Corp.

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust CompanyJPMorgan Chase Bank, as Trustee ▇▇▇ ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇, ▇▇▇▇ ▇▇▇▇▇ Santa Ana▇▇▇ ▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Institutional Trust Administration WA02AH Services, WaMu Series 2002-S7 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17S7, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust CompanyJPMorgan Chase Bank, as Trustee ▇▇▇ ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇, ▇▇▇▇ ▇▇▇▇▇ Santa Ana▇▇▇ ▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Institutional Trust Administration WA02AH Services, WaMu Series 2002-S7 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17S7, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ----------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------------------------------------- ----------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-9 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR179, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-9 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] 9 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- E-2 ------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- AGREED TO AND ACCEPTED BY PNC MORTGAGE SECURITIES CORP. ------------------------------------------------------- ------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------ ---------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 Attn: Trust Administration WA02AH ▇▇ ▇▇▇▇▇ Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20021998-AR177, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇Company ▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:Corp.

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-5 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR174, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- -------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-5 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] 4 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ---------------------------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A4 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17AR4, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A4 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] AR4 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A4 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR4, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A4 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR4, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S5 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17S5, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S5 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17S5, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ------------------------------------------------------------------------------ Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------------------ Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- ------------------------------------------------------------------------------ Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS5 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17MS5, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS5 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17MS5, Class [_______] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: 65-0▇▇▇▇▇▇ ▇▇▇▇---------------------------- The above partnership consists of the following members : INVESTORS TRUST, INC.-G.P. -------------------------------------- --------------------------------------- ------------------------------------------- -------------------------------------- --------------------------------------- ------------------------------------------- (1) The Financial Institution named above is designated as a depository for the funds of this partnership. (2) This resolution shall continue to have effect until express written notice of its rescission or modification has been received and recorded by this Financial Institution. Any and all prior resolutions adopted by this partnership and certified to this Financial Institution as governing the operation of this partnership's account(s), are in full force and effect, unless supplemented or modified by this authorization. (3) All transactions, if any, with respect to any deposits, withdrawals, rediscounts and borrowings by or on behalf of this partnership with this Financial Institution prior to the adoption of this resolution are hereby ratified, approved and confirmed. (4) Any of the persons named below, so long as they act in a representative capacity as agents of this partnership, are authorized to make any and all other contracts, agreements, stipulations and orders which they may deem advisable for the effective exercise of their powers indicated below, from time to time with this Financial Institution, concerning funds deposited in this Financial Institution, moneys borrowed from this Financial Institution or any other business transacted by and between this partnership and this Financial Institution subject to any restrictions stated below. (5) If any other parties become interested in this partnership as co-partners, the partnership relationship is altered in any way or if the business should become incorporated, the partners shall notify this Financial Institution promptly. (6) This partnership agrees to the terms and conditions of any account agreement, property opened by any authorized representative(s) of this partnership, and authorizes the Financial Institution named above, at any time, to charge this partnership for all checks, drafts, or other orders for the payment of money that are drawn on this Financial Institution, regardless of by whom or by what means the facsimile signature(s) may have been affixed so long as they resemble the facsimile signature specimens shown below, (or the facsimile signature specimens that this partnership filed with this Financial Institution from time to time) and contain the required number of signatures for this purpose. If indicated, any person listed below (subject to any expressed restrictions) is authorized to: Name and Title Signature Facsimile Signature if used (A) INVESTORS TRUST, INC., ALLA▇ ▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇ES. /s/ Alla▇ ▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:---------------------------------------- --------------------------------------- -----------------------------------

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A3 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17AR3, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A3 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] AR3 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS11 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS11, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS11 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS11, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ---------------------------------------------------------------- ---------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ---------------------------------------------------------------- ---------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------- ------------------ ----------- ----- Signature of the Company's authorized Date officer Date Agreed to and accepted by Washington Mutual PNC Mortgage Securities Corp. -------------------------------------------------------------------------------- ---------------------------------------------------------------- ---------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------- ------------------ ----------- ----- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, PNC 2000-4 Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Pass- Through Certificates Series 20022000-AR174, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Washington Mutual Department, PNC 2000-4 PNC Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Class [ ] Certificates evidencing an undivided interest in PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022000-AR17, Class [_____] 4 (the "Purchased Certificates") in the principal amount of $______________--------------. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ---------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ---------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------------------- ------------- Signature of the Company's authorized Date officer Date Agreed to and accepted by Washington Mutual PNC Mortgage Securities Corp. -------------------------------------------------------------------------------- ---------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------------- ------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, PNC 2000-1 181 Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Pass- Through Certificates Series 20022000-AR171, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Washington Mutual Department, PNC 2000-1 PNC Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Class [ ] Certificates evidencing an undivided interest in PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022000-AR17, Class [_____] 1 (the "Purchased Certificates") in the principal amount of $______________$ . In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AC Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR12, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AC Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR12, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AJ Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR19, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AJ Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR19, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------- ------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. AGREED TO AND ACCEPTED BY WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------- -------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-3 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR173, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-3 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] 3 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S11 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17S11, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S11 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] S11 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------ ----------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------ ----------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS7 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17MS7, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS7 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17MS7, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA03AC Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022003-AR17AR12, Class [_____] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA03AC Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022003-AR17AR12, Class [______] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A2 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR2, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A2 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR2, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------------- -------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------------- -------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AG Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR16, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AG Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR16, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17S1, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17S1, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A5 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR5, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A5 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR5, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS4 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS4, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS4 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS4, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS5 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS5, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS5 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS5, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2003-AR1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17AR1, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2003-AR1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17AR1, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------- ---------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------- ---------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust CompanyCitibank, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇, 14th Floor, ▇▇▇▇ ▇ ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Structured Finance Group, Washington Mutual 2003-S11 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022003-AR17S11, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust CompanyCitibank, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇, 14th Floor, ▇▇▇▇ ▇ ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Structured Finance Group, Washington Mutual 2003-S11 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022003-AR17S11, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------------- -------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------------- -------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS7 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS7, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- --------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS7 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS7, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S8 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17S8, Class [__] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-S8 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17S8, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2002-AR2 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17AR2, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- --------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2002-AR2 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17AR2, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS9 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17MS9, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS9 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17MS9, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AE Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR14, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- --------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02AE Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR14, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A7 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR7, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A7 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR7, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organization Organized under laws of -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Typed name and title of the CompanySeller's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------- ---------------------------------- Signature of the CompanySeller's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- PNC MORTGAGE SECURITIES CORP. ------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------- ----------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH MN 55101 Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20021998-AR174, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- --------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust Company, as Trustee ▇Association ▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇. ▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual ▇▇, MN 55101 PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:Corp.

Number. Type of organization Organization Organized under laws of -------------------------------------------------------------------------------- ---------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ---------------------------------------------------------------------------- Typed name and title of the CompanySeller's authorized officer ------------------------------------------------------- ---------------------- ----------------------------------------- ------------------------------- Signature of the CompanySeller's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- ---------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------------------------- ------------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CLASS B-4, CLASS B-5 AND CLASS B-6 CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH MN 55101 Re: Purchase of Washington Mutual PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20021997-AR175, Class [_B-4] [B-5] [B-6] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- --------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CLASS B-4, CLASS B-5 AND CLASS B-6 CERTIFICATES [Date] Deutsche U.S. Bank National Trust Company, as Trustee Association ▇▇▇ ▇▇▇▇ ▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual MN 55101 PNC Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual [Class B-4] [Class B-5] [Class B-6] Certificates evidencing an undivided interest in PNC Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20021997-AR17, Class [_____] 5 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS3 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17MS3, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS3 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17MS3, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type CLF8 -------------------------------------------------------------------------------- Clinical Laboratory Improvement Amendments (CLIA) ID: 05D-0642841 -------------------------------------------------------------------------------- CAP Accreditation Lab Number: 29982-01 -------------------------------------------------------------------------------- Dr. ▇▇▇▇▇▇▇'▇ ▇▇▇sician and Surgeon's Certificate Number: G49695 -------------------------------------------------------------------------------- Drug Enforcement Administration (DEA) Registration Number: A52449204 -------------------------------------------------------------------------------- Dr. ▇▇▇▇▇▇▇'▇ ▇▇▇sician's Certificate Number: G49695 -------------------------------------------------------------------------------- Dr. ▇▇▇▇▇▇▇'▇ ▇▇▇ Registration Number: A52449204 -------------------------------------------------------------------------------- Medicare Provider Number: X058002 -------------------------------------------------------------------------------- Medi-Cal Provider Number: LAB 00008F -------------------------------------------------------------------------------- CHDP Provider Number: LAB 00008F -------------------------------------------------------------------------------- 35 EXHIBIT A PROMISSORY NOTE 36 PROMISSORY NOTE $5,000,000.00 Los Angeles, California February 24, 1997 FOR VALUE RECEIVED, the undersigned, Physicians Clinical Laboratory, Inc., a California corporation (the "Buyer"), promises to pay to the order of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇Nu-Tech Bio-Med, Inc., a Delaware corporation (the "Seller"), at the Seller's offices at 500 ▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned at such other place as the holder of this Promissory Note (this "Note") may from time to time designate in writing, the principal sum of Five Million Dollars ($5,000,000.00), plus interest on the unpaid principal balance of this Note outstanding from time to time, on the terms and conditions set forth below. This Note is made pursuant to that certain Stock Purchase Agreement ("Stock Purchase Agreement") dated February 24, 1997 between Buyer and Seller. Terms not otherwise defined herein shall have the meanings set forth in the Stock Purchase Agreement or that certain Security Agreement dated of even date herewith between Buyer and Seller executed in connection therewith (the "PurchaserSecurity Agreement") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:).

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ------------------------------------------------ ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ------------------------------------------------ ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-8 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR178, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-8 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] 8 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S9 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR17S9, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-S9 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] S9 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS10 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Washington Mutual MSC Mortgage Pass-Through Certificates Series 20022001-AR17MS10, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS10 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Washington Mutual MSC Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] MS10 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS9 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS9, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS9 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS9, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------------- -------------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------------- -------------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2002-AR1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17AR1, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual MSC 2002-AR1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17AR1, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS2 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17MS2, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS2 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17MS2, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------- ---------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------- ---------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS8 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS8, Class [_______] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS8 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS8, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ------------------------------------------------------ ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ------------------------------------------------------ ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A8 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR8, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A8 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR8, Class [_____] (the "Purchased Certificates") in the principal amount of $_________________ . In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- ------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- --------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ----------- Signature of the Company's authorized officer Date --------------------------------------------------------------------- Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- ------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------- --------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-2 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022001-AR172, Class [_[ ] (the 155 "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-2 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] 2 (the "Purchased Certificates") in the principal amount of $______________$ . In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. AGREED TO AND ACCEPTED BY PNC MORTGAGE SECURITIES CORP. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F [RESERVED] Exhibit G [RESERVED] Exhibit H FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE ADDITIONAL MATTER INCORPORATED INTO THE FORM OF THE CERTIFICATES [Date] Deutsche (OTHER THAN THE CLASS R-1 CERTIFICATES) This Certificate does not represent an obligation of or interest in PNC Mortgage Securities Corp. or any of its affiliates, including PNC Bank National Corp. Neither this Certificate nor the underlying Mortgage Loans are guaranteed by any agency or instrumentality of the United States. This certifies that the above-named Registered Owner is the registered owner of certain interests in a trust fund (the "REMIC II Trust Fund") whose assets consist of interests in a trust fund (the "REMIC I Trust Fund") whose assets consist of, among other things, a pool (the "Mortgage Pool") of conventional one- to four-family mortgage loans (the "Mortgage Loans"), formed and administered by PNC Mortgage Securities Corp. (the "Company"), which term includes any successor entity under the Pooling Agreement referred to below. The Mortgage Pool was created pursuant to a Pooling and Servicing Agreement, dated as of the Cut-Off Date stated above (the "Pooling Agreement"), between the Company and State Street Bank and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "CertificatesTrustee") Ladies and Gentlemen: In connection with our disposition ), a summary of certain of the above Certificates we certify that (a) we understand pertinent provisions of which is set forth hereafter. To the Certificates extent not defined herein, the capitalized terms used herein have the meanings assigned in the Pooling Agreement. Nothing herein shall be deemed inconsistent with such meanings, and in the event of any conflict between the Pooling Agreement and the terms of this Certificate, the Pooling Agreement shall control. This Certificate is issued under and is subject to the terms, provisions and conditions of the Pooling Agreement, to which Pooling Agreement the Holder of this Certificate, by virtue of the acceptance hereof, assents and by which such Holder is bound. Distributions will be made, pursuant to the Pooling Agreement, on the 25th day of each month or, if such 25th day is not been registered under a Business Day, the Securities Act of 1933, as amended Business Day immediately following (the "ActDistribution Date"), commencing on the first Distribution Date specified above, to the Person in whose name this Certificate is registered at the close of business on the last day (or if such last day is not a Business Day, the Business Day immediately preceding such last day) and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation month immediately preceding the month of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned such distribution (the "PurchaserRecord Date") proposes ), to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17, Class [_____] (the "Purchased Certificates") extent of such Certificateholder's Percentage Interest represented by this Certificate in the principal amount portion of $______________the REMIC II Available Distribution Amount for such Distribution Date then distributable on the Certificates of this Class, as specified in Section 4.04 of the Pooling Agreement. In doing soDistributions on this Certificate will be made by the Trustee by wire transfer or check mailed to the address of the Person entitled thereto, as such name and address shall appear on the Certificate Register. Notwithstanding the above, the Purchaser final distribution on this Certificate will be made after due notice by the Trustee of the pendency of such distribution and only upon presentation and surrender of this Certificate to the Certificate Registrar. Reference is hereby acknowledges and agrees made to the further provisions of this Certificate set forth below, which further provisions shall for all purposes have the same effect as follows:if set forth at this place. Unless the certificate of authentication hereon has been executed by or on behalf of the Trustee, by manual signature, this Certificate shall not be entitled to any benefit under the Pooling Agreement or be valid for any purpose.

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS2 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS2, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS2 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS2, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: BY /s/ Tom Steele 2-7-2002 ----------------------------------------------- --------------------------- Signature Date Tom Steele Corporate Trust Offi▇▇▇ ------------------------------------------------- --------------------------- Name Title PO Box 5304 141 N Main Ave Sioux Falls, SD ▇▇▇▇▇-▇▇▇▇ ---------------------------------- -------------------- ------------- Street Address City and State ▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇▇▇▇ /▇/ ▇▇▇▇ ▇. ▇▇▇▇▇▇ July 16, 2002 ---------------------------------- ----------------------------------------- Authorized Signature Date Kala M. Stroup Commissioner of Higher Educati▇▇ ---------------------------------- ----------------------------------------- Name Title RETURN TWO SIGNED COPIES TO THE MISSOURI COORDINATING BOARD FOR HIGHER EDUCATION FEDERAL CONSOLIDATION LOAN PROGRAM CERTIFICATE OF COMPREHENSIVE INSURANCE The undersigned Missouri Coordinating Board for Higher Education (CBHE) authorizes that all Federal Consolidation Loans made in conformity with the requirements of Part B of Title IV of the Higher Education Act of 1965, as amended, by Student Loan Finance Corporation and Subsidiaries (US Bank Trustee) (Lender Code: 833405), herein referred to as the "PurchaserEligible Lender", are fully insured against loss of principal and interest by the CBHE, provided: 1) proposes The Eligible Lender has determined to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificatesits satisfaction, Series 2002-AR17in accordance with reasonable and prudent business practices, Class [_____] (for each loan being consolidated -- a) that the "Purchased Certificates"loan is a legal, valid, and binding obligation of the borrower; b) that each such loan was made and serviced in compliance with all applicable laws and regulations; and c) that, in the case of loans made under Part B of Title IV, the insurance on such loan is in full force and effect. 2) That the Federal Consolidation Loan(s) will be made on or after July 16, 2002 but no later than provided for in the Higher Education Act of 1965, as amended. 3) That the total unpaid principal amount of all Federal Consolidation Loans made under this certificate by Lender Code 833405 is equal to or less than $______________. In doing so10 million. 4) That, if the Eligible Lender, prior to the expiration of this certificate, no longer proposes to make Federal Consolidation Loans or make Federal Consolidation Loans under the CBHE's guarantee, the Purchaser hereby acknowledges Eligible Lender will provide the CBHE with written notification in order that the certificate may be terminated. Such termination shall not affect the insurance on any Federal Consolidation Loan made prior to such termination. 5) That the Eligible Lender's Federal Consolidation Loan Program practices are subject to the CBHE's Student Loan Program lender participation limitation, suspension and agrees termination procedures. The insurance on any Federal Consolidation Loan(s) made under this certificate prior to the CBHE's imposition of a limitation, suspension, or termination action shall not be affected by such action. 6) That the Eligible Lender complies with the CBHE's reporting requirements specified in the Common Manual and the Missouri Student Loan Program (MSLP) Federal Consolidation Loan Policies and Procedures. 7) That the Eligible Lender offers Federal Consolidation Loan borrowers repayment terms and a choice of repayment schedules as follows:required by the Higher Education Act of 1965, as amended, and applicable regulations.

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ----------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022001-AR17AR1, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA01A1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] AR1 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- --------------------------------------------- ------------------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 2002-AR17MS1, Class [_] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2002-MS1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 2002-AR17MS1, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------- ------------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------- ------------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS4 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022003-AR17MS4, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ----------------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche U.S. Bank National Trust CompanyAssociation, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇▇▇ Santa Ana▇▇▇▇▇ ▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2003-MS4 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022003-AR17MS4, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- -------------------------------------------------- ------------------------ Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------------------- ------------------------ Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A1 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 2002-AR17AR1, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ---------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Bankers Trust CompanyCompany of California, N.A., as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA02A1 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 2002-AR17AR1, Class [_____[ ] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- ---------------------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS12 Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates Series 20022001-AR17MS12, Class [_[ ] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- --------------------------------- Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche State Street Bank National and Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇▇ Santa Ana▇▇▇▇▇▇, CA 92705 ▇▇ ▇▇▇▇▇ Attn: Corporate Trust Administration WA02AH Department, Washington Mutual 2001-MS12 Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Class [ ] Certificates evidencing an undivided interest in Washington Mutual Mortgage Securities Corp. WaMu MSC Mortgage Pass-Through Certificates, Series 20022001-AR17, Class [_____] MS12 (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows:

Number. Type of organization Organized under laws of -------------------------------------------------------------------------------- Principal place of business: ▇▇▇▇▇▇ ▇▇▇▇▇▇▇, ▇▇▇▇, ▇▇▇▇▇, zip code -------------------------------------------------------------------------------- Typed name and title of the Company's authorized officer ------------------------------------------------------- ---------------------- --------------------------------------------- ----------------------- Signature of the Company's authorized officer Date Agreed to and accepted by Washington Mutual Mortgage Securities Corp. -------------------------------------------------------------------------------- Typed name and title of authorized representative ------------------------------------------------------- ---------------------- -------------------------------------- ----------------------- Signature of authorized representative Date Exhibit F FORM OF TRANSFEROR CERTIFICATE FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA03AB Re: Purchase of Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates Series 20022003-AR17AR11, Class [__] (the "Certificates") Ladies and Gentlemen: In connection with our disposition of the above Certificates we certify that (a) we understand the Certificates have not been registered under the Securities Act of 1933, as amended (the "Act") and are being disposed by us in a transaction that is exempt from the registration requirements of the Act, and (b) we have not offered or sold any certificates to, or solicited offers to buy any Certificates from, any person, or otherwise approached or negotiated with any person with respect thereto, or taken any other action which would result in a violation of Section 5 of the Act. Very truly yours, [Name of Transferor] By: -------------------------------- ------------------------------------ Authorized Officer Exhibit G FORM OF TRANSFEREE'S AGREEMENT FOR JUNIOR SUBORDINATE CERTIFICATES [Date] Deutsche Bank National Trust Company, as Trustee ▇▇▇▇ ▇▇▇▇ ▇▇. ▇▇▇▇▇▇ ▇▇▇▇▇ Santa Ana, CA 92705 Attn: Trust Administration WA02AH WA03AB Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ The undersigned (the "Purchaser") proposes to purchase Washington Mutual Mortgage Securities Corp. WaMu Mortgage Pass-Through Certificates, Series 20022003-AR17AR11, Class [_____] (the "Purchased Certificates") in the principal amount of $______________. In doing so, the Purchaser hereby acknowledges and agrees as follows: