Security Group 3 PSA Prepayment Assumption Rates Class KE Classes SF, SI, SX, SY, TB and TO Class ZA Class ZC Distribution Date 0% 100% 295% 350% 600% 0% 100% 295% 350% 600% 0% 100% 295% 350% 600% 0% 100% 295% 350% 600% Initial Percent ..................    100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 100 October 2008....................    100 100 100 100 100 100 100 92 89 79 106 106 106 106 106 106 106 106 106 106 October 2009....................    100 100 100 100 100 100 100 74 67 35 113 113 113 113 113 113 113 113 113 113 October 2010....................    100 100 100 100 0 100 100 53 40 0 120 120 120 120 120 120 120 120 120 0 October 2011....................    100 100 100 100 0 100 100 37 22 0 127 127 127 127 127 127 127 127 127 0 October 2012....................    100 100 100 100 0 100 100 26 10 0 135 135 135 135 135 135 135 135 135 0 October 2013....................    100 100 100 100 0 100 100 19 3 0 143 143 143 143 143 143 143 143 143 0 October 2014....................    100 100 100 19 0 100 100 15 0 0 152 152 152 152 152 152 152 152 122 0 October 2015....................    100 100 100 0 0 100 100 13 0 0 161 161 161 161 161 161 161 161 0 0 October 2016....................    100 100 100 0 0 100 98 12 0 0 171 171 171 171 171 171 171 171 0 0 October 2017....................    100 100 100 0 0 100 95 10 0 0 182 182 182 182 182 182 182 182 0 0 October 2018....................    100 100 100 0 0 100 91 9 0 0 193 193 193 193 121 193 193 193 0 0 October 2019....................    100 100 100 0 0 100 86 8 0 0 205 205 205 205 75 205 205 205 0 0 October 2020....................    100 100 99 0 0 99 80 6 0 0 218 218 218 218 47 218 218 218 0 0 October 2021....................    100 100 83 0 0 99 74 5 0 0 231 231 231 231 29 231 231 231 0 0 October 2022....................    100 68 68 0 0 99 69 4 0 0 245 245 245 245 18 245 245 245 0 0 October 2023....................    100 56 56 0 0 99 63 3 0 0 261 248 248 248 11 261 261 261 0 0 October 2024....................    100 46 46 0 0 99 57 2 0 0 277 187 187 187 7 277 277 277 0 0 October 2025....................    100 37 37 0 0 99 51 2 0 0 294 140 140 140 4 294 294 294 0 0 October 2026....................    100 29 29 0 0 99 45 1 0 0 312 104 104 104 2 312 312 312 0 0 October 2027....................    100 23 23 0 0 99 40 0 0 0 331 77 77 77 1 331 331 331 0 0 October 2028....................    100 18 18 0 0 99 35 0 0 0 351 56 56 56 1 351 351 312 0 0 October 2029....................    100 14 14 0 0 99 30 0 0 0 373 41 41 41 1 373 373 242 0 0 October 2030....................    100 10 10 0 0 99 25 0 0 0 396 29 29 29 0 396 396 185 0 0 October 2031....................    100 8 8 0 0 98 20 0 0 0 157 20 20 20 0 421 421 137 0 0 October 2032....................    100 5 5 0 0 87 16 0 0 0 14 14 14 14 0 446 446 99 0 0 October 2033....................    100 4 4 0 0 72 11 0 0 0 9 9 9 9 0 474 474 68 0 0 October 2034.................... 2 2 2 0 0 56 7 0 0 0 5 5 5 5 0 503 503 43 0 0 October 2035.................... 1 1 1 0 0 38 3 0 0 0 3 3 3 3 0 534 534 24 0 0 October 2036.................... 0 0 0 0 0 18 0 0 0 0 1 1 1 1 0 567 531 9 0 0 October 2037.................... 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Weighted Average Life (years)  ..................   26.2    17.7    17.5 6.7 2.8 27.1 18.4 4.4 2.8 1.6 24.0 19.1 19.1 19.1 12.2 29.9 29.4 23.8 7.2 2.8 Security Groups 1 and 3 PSA Prepayment Assumption Rates Classes PF and PO Distribution Date 0% 100% 295% 350% 600% Initial Percent ..................    100 100 100 100 100 October 2008.................... 98 95 95 95 95 October 2009.................... 97 87 87 87 87 October 2010.................... 95 75 75 75 70 October 2011.................... 93 65 65 65 44 October 2012.................... 91 54 54 54 27 October 2013.................... 89 45 45 45 16 October 2014.................... 86 36 36 36 9 October 2015.................... 84 28 28 28 5 October 2016.................... 81 21 21 21 2 October 2017.................... 78 15 15 15 0 October 2018.................... 75 11 11 11 0 October 2019.................... 71 8 8 8 0 October 2020.................... 67 5 5 5 0 October 2021.................... 63 3 3 3 0 October 2022.................... 58 1 1 1 0 October 2023.................... 53 0 0 0 0 October 2024.................... 48 0 0 0 0 October 2025.................... 42 0 0 0 0 October 2026.................... 36 0 0 0 0 October 2027.................... 29 0 0 0 0 October 2028.................... 22 0 0 0 0 October 2029.................... 14 0 0 0 0 October 2030.................... 5 0 0 0 0 October 2031.................... 0 0 0 0 0 October 2032.................... 0 0 0 0 0 October 2033.................... 0 0 0 0 0 October 2034.................... 0 0 0 0 0 October 2035.................... 0 0 0 0 0 October 2036.................... 0 0 0 0 0 October 2037.................... 0 0 0 0 0 Weighted Average Life (years)  ..................   15.3 6.0 6.0 6.0 4.1 S-26