The yields were calculated by 1. determining the monthly discount rates that, when applied to the applicable assumed streams of cash flows to be paid on the applicable Class, would cause the discounted present value of the assumed streams of cash flows to equal the assumed purchase price of that Class plus accrued interest (in the case of interest-bearing Classes), and 2. converting the monthly rates to corporate bond equivalent rates. These calculations do not take into account variations that may occur in the interest rates at which  investors  may  be  able  to  reinvest  funds  received  by  them  as  distributions  on  their Securities and consequently do not purport to reflect the return on any investment in any Class when those reinvestment rates are considered. The information set forth in the following tables was prepared on the basis of the Modeling Assumptions and the assumptions that (1) the Interest Rate applicable to each Inverse Floating Rate Class for each Accrual Period following the first Accrual Period will be based on the indicated level of LIBOR and (2) the purchase price of each Class (expressed as a percentage of its original Class Principal Balance or Class Notional Balance) plus accrued interest (in the case  of  the  interest-bearing  Classes)  is  as  indicated  in  the  related  table.  The  assumed purchase price is not necessarily that at which actual sales will occur. SECURITY GROUP 1 Sensitivity of Class IM to Prepayments Assumed Price 0.046875%* PSA Prepayment Assumption Rates LIBOR 150% 297% 450% 600% 6.58% and below ...................... 37.5% 29.7% 21.1% 12.3% 6.59%  .......................................... 12.2% 3.0%   (7.5)%   (18.3)% 6.60% and above ...................... ** ** ** ** Sensitivity of Class PO to Prepayments Assumed Price 72.00000% PSA Prepayment Assumption Rates 150% 297% 450% 600% 4.0% 6.5% 9.1% 11.5% * 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-24