SECURITY GROUP 1 Sensitivity of Class DO to Prepayments Assumed Price 73.25% PSA Prepayment Assumption Rates 100% 295% 350% 600% 5.6% 5.6% 5.6% 8.1% Sensitivity of Class IG to Prepayments Assumed Price 10.0%* PSA Prepayment Assumption Rates 100% 295% 350% 430% 600% 65.7% 33.4% 18.6% 0.2%   (30.6)% Sensitivity of Class IO to Prepayments Assumed Price 12.0%* PSA Prepayment Assumption Rates 100% 295% 350% 600% 698% 53.5% 29.4% 29.4% 8.2% 0.1% Sensitivity of Class PS to Prepayments Assumed Price 6.265625%* PSA Prepayment Assumption Rates LIBOR 100% 295% 350% 600% 4.13%................................................ 30.9% 30.9% 30.9% 23.3% 5.13%................................................ 10.8% 10.8% 10.8%   (0.1)% 6.13%................................................           (12.9)%        (12.9)%        (12.9)%         (29.8)% 6.67% and above............................ ** ** ** ** *    The price does not include accrued interest. Accrued interest has been added to the price in calculating the yields set forth in the table. **  Indicates that investors will suffer a loss of virtually all of their investment. S-33