Class LT Principal Reduction Amounts definition

Class LT Principal Reduction Amounts. For any Payment Date, the amounts by which the principal balances of the REMIC II Regular Interest LT1, REMIC II Regular Interest LT2, REMIC II Regular Interest LT3 and REMIC II Regular Interest LT4 respectively will be reduced on such Payment Date by the allocation of Liquidation Loss Amounts and the distribution of principal, determined as follows: For purposes of the succeeding formulas the following symbols shall have the meanings set forth below: Y1 = the Class Principal Balance of the REMIC II Regular Interest LT1 after the allocation of REMIC II Liquidation Loss Amounts and making of distributions on the prior Payment Date. Y2 = the Class Principal Balance of the REMIC II Regular Interest LT2 after the allocation of REMIC II Liquidation Loss Amounts and making of distributions on the prior Payment Date. Y3 = the Class Principal Balance of the REMIC II Regular Interest LT3 after the allocation of REMIC II Liquidation Loss Amounts and making of distributions on the prior Payment Date. Y4 = the Class Principal Balance of the REMIC II Regular Interest LT4 after the allocation of REMIC II Liquidation Loss Amounts and making of distributions on the prior Payment Date (note: Y4 = Y3 ).

Class LT Principal Reduction Amounts. For any Payment Date, the amounts by which the principal balances of the Class LT1, Class LT2, Class LT3 and Class LT4 Regular Interests respectively will be reduced on such Payment Date by the allocation of Liquidation Loss Amounts and the distribution of principal, determined as follows: For purposes of the succeeding formulas the following symbols shall have the meanings set forth below: Y1 = the Class Principal Balance of the Class LT1 REMIC I Regular Interest after the allocation of REMIC I Liquidation Loss Amounts and making of distributions on the prior Payment Date. Y2 = the Class Principal Balance of the Class LT2 REMIC I Regular Interest after the allocation of REMIC I Liquidation Loss Amounts and making of distributions on the prior Payment Date. Y3 = the Class Principal Balance of the Class LT3 REMIC I Regular Interest after the allocation of REMIC I Liquidation Loss Amounts and making of distributions on the prior Payment Date. Y4 = the Class Principal Balance of the Class LT4 REMIC I Regular Interest after the allocation of REMIC I Liquidation Loss Amounts and making of distributions on the prior Payment Date (note: Y4 = Y3). ?Y1 = the Class LT1 Principal Reduction Amount. ?Y2 = the Class LT2 Principal Reduction Amount. ?Y3 = the Class LT3 Principal Reduction Amount. ?Y4 = the Class LT4 Principal Reduction Amount. P0 = the aggregate principal balance of the Class LT1, Class LT2, Class LT3 and Class LT4 REMIC I Regular Interests after distributions and the allocation of Liquidation Loss Amounts on the prior Payment Date. = the aggregate principal balance of the Mortgage Loans after giving effect to principal payments distributed and Liquidation Loss Amounts allocated on the prior Payment Date.

Class LT Principal Reduction Amounts. (which has been intentionally omitted from this filing) may be obtained from Washington Mutual Mortgage Securities Corp. or State Street Bank and Trust Company by contacting, in the case of Washington Mutual Mortgage Securities Corp., ▇▇▇▇▇▇ ▇▇▇▇▇ Master Servicing Department Washington Mutual Mortgage Securities Corp. ▇▇ ▇. ▇▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇ Telephone: (▇▇▇) ▇▇▇-▇▇▇▇ Facsimile: (▇▇▇) ▇▇▇-▇▇▇▇ in the case of State Street Bank and Trust Company, ▇▇▇▇▇ ▇▇▇▇▇▇ ▇▇▇▇▇ ▇▇▇▇▇▇ Corporation Global Investor Services Group Corporate Trust ▇ ▇▇▇▇▇▇ ▇▇ ▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇▇, ▇▇ ▇▇▇▇▇-▇▇▇▇ Telephone: (▇▇▇) ▇▇▇-▇▇▇▇ Facsimile: (▇▇▇) ▇▇▇-▇▇▇▇ Exhibit A CUSIP 939335 AA3 MORTGAGE PASS-THROUGH CERTIFICATE Class A-1-V Evidencing a Percentage Interest in a trust fund whose assets consist of interests in another trust fund whose assets consist of, among other things, a pool of conventional one- to four-family mortgage loans formed and administered by WASHINGTON MUTUAL MORTGAGE SECURITIES CORP. This Certificate represents ownership of a "regular interest" in a "real estate mortgage investment conduit," as those terms are defined in Sections 860G and 860D, respectively, of the Internal Revenue Code of 1986, as amended. The issue date of this Certificate is March 28, 2001. Unless this Certificate is presented by an authorized representative of The Depository Trust Company, a New York corporation ("DTC"), to the Company or its agent for registration of transfer, exchange, or payment, and any Certificate issued is registered in the name of Cede & Co. or such other name as is requested by an authorized representative of DTC (and any payment is made to Cede & Co. or to such other entity as is requested by an authorized representative of DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL inasmuch as the registered owner hereof, Cede & Co., has an interest herein. NO TRANSFER OF THIS CLASS A-1-V CERTIFICATE PRIOR TO THE DISTRIBUTION DATE IN MARCH 2005 WILL BE MADE UNLESS THE TRUSTEE HAS RECEIVED (I) AN OFFICER'S CERTIFICATE IN THE FORM DESCRIBED IN SECTION 5.01(g) OF THE POOLING AGREEMENT AND (II) IF SO INDICATED IN SUCH OFFICER'S CERTIFICATE, AN OPINION OF COUNSEL ACCEPTABLE TO AND IN FORM AND SUBSTANCE SATISFACTORY TO THE TRUSTEE AND THE COMPANY TO THE EFFECT THAT THE PURCHASE AND HOLDING OF THIS CERTIFICATE ARE PERMISSIBLE UNDER APPLICABLE LAW, WILL NOT CONSTITUTE OR RESULT IN A NON-EXEMPT PROHIBITED TRANSACTION UN...