CUSIP No. 67612W108 AGREEMENT CONCERNING JOINT FILING OF AMENDMENT NO. 1 TO SCHEDULE 13D The undersigned agree as follows: (i) each of them is individually eligible to use Schedule 13D to which this Exhibit is attached, and such Schedule 13D is filed...
CUSIP No.  ▇▇▇▇▇▇▇▇▇
                        AGREEMENT CONCERNING JOINT FILING
                       OF AMENDMENT NO. 1 TO SCHEDULE 13D
         The undersigned agree as follows:
         (i) each of them is individually eligible to use Schedule 13D to which
this Exhibit is attached, and such Schedule 13D is filed on behalf of each of
them; and
         (ii) each of them is responsible for the timely filing of such Schedule
13D and any amendments thereto, and for the completeness and accuracy of the
information concerning such person contained therein; but none of them is
responsible for the completeness or accuracy of the information concerning the
other person making the filing, unless such person knows or has reason to
believe that such information is inaccurate.
         This Agreement may be executed in any number of counterparts, each of
which shall be deemed to be an original, but all of which, taken together, shall
constitute one and the same instrument.
         Dated ▇▇▇▇▇ ▇, ▇▇▇▇
                                          ▇. ▇▇▇▇ ▇▇▇▇▇
                                           /s/  V. ▇▇▇▇ ▇▇▇▇▇
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                                          1109519 ONTARIO LIMITED
                                          By:  /s/  V. ▇▇▇▇ ▇▇▇▇▇
                                              ----------------------------------
                                              Name:   V. ▇▇▇▇ ▇▇▇▇▇
                                              Title:  President
                                          THE SIXTY TWO INVESTMENT COMPANY
                                          LIMITED
                                          By:  /s/  V. ▇▇▇▇ ▇▇▇▇▇
                                              ----------------------------------
                                              Name:   V. ▇▇▇▇ ▇▇▇▇▇
                                              Title:  President
                                          810679 ONTARIO LIMITED
                                          By:  /s/  V. ▇▇▇▇ ▇▇▇▇▇
                                              ----------------------------------
                                              Name:   V. ▇▇▇▇ ▇▇▇▇▇
                                              Title:  President
                                          FAIRFAX FINANCIAL HOLDINGS LIMITED
                                          By:  /s/  ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              Title:  Vice President, Corporate
                                                      Affairs
                                          FFHL GROUP LTD.
                                          By:  /s/  ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              Title:  Vice President
                                          FAIRFAX INC.
                                          By:  /s/  ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              Title:  Chairman
                                          FAIRFAX FINANCIAL (US) LLC
                                          By:  /s/  ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇▇
                                              Title:  Vice President
                                          TIG HOLDINGS, INC.
                                          By:  /s/  ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              Title:  Vice President
                                          TIG INSURANCE GROUP
                                          By:  /s/  ▇▇▇▇▇ ▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇▇ ▇▇▇▇▇▇▇
                                              Title:  President
                                          TIG INSURANCE COMPANY
                                          By:  /s/  ▇▇▇▇▇ ▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇▇ ▇▇▇▇▇▇▇
                                              Title:  President
                                          ORH HOLDINGS INC.
                                          By:  /s/  ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              ----------------------------------
                                              Name:   ▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
                                              Title:  Vice President