Sensitivity of Class SI to Prepayments Assumed Price 8.25%* PSA Prepayment Assumption Rates LIBOR 100% 170% 260% 400% 4.12%................................................ 18.2% 18.2% 18.2% 10.3% 5.12%................................................ 3.8% 3.8% 3.8%   (5.8)% 6.12%................................................          (13.6)%         (13.6)%         (13.6)%         (25.8)% 6.74% and above............................ ** ** ** ** Sensitivity of Class US to Prepayments Assumed Price 94.9140625%* PSA Prepayment Assumption Rates LIBOR 100% 170% 260% 400% 4.12%................................................ 7.8% 7.8% 7.8% 8.2% 5.12%................................................ 5.2% 5.2% 5.2% 5.5% 6.12%................................................ 2.5% 2.5% 2.5% 2.9% 6.74% and above............................ 0.9% 0.9% 0.9% 1.3% Sensitivity of Class VS to Prepayments Assumed Price 98.9921875%* PSA Prepayment Assumption Rates LIBOR 100% 170% 260% 400% 4.12%................................................ 8.2% 8.2% 8.2% 8.3% 5.12%................................................ 5.1% 5.1% 5.1% 5.2% 6.12%................................................ 2.1% 2.1% 2.1% 2.2% 6.74% and above............................ 0.2% 0.2% 0.2% 0.3% SECURITY GROUP 2 Sensitivity of Class FI to Prepayments Assumed Price 0.15625%* PSA Prepayment Assumption Rates LIBOR 100% 352% 550% 750% 6.500% and below............................       27.6% 14.4% 3.7%   (7.5)% 6.525% ................................................ 9.2%  (5.0)%   (16.8)%   (29.4)% 6.550% 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-25