SECURITY GROUP 10 The Group 10 Principal Distribution Amount will be allocated to CO, until retired Scheduled  Principal  Balances: The  Scheduled  Principal  Balances  for  the  Classes  listed below are included in Schedule II to this Supplement. They were calculated using, among other things, the following Structuring Ranges or Rate: Class Structuring Ranges or Rate PO ............................................................................................................ 125% PSA through 250% PSA UO............................................................................................................ 125% PSA through 250% PSA AO ............................................................................................................ 125% PSA through 250% PSA EO ............................................................................................................ 125% PSA through 250% PSA SA.............................................................................................................. 230% PSA Notional Classes:  The Notional Classes will not receive distributions of principal but have Class Notional Balances for convenience in describing their entitlements to interest. The Class Notional Balance of each Notional Class represents the percentage indicated below of, and reduces to that extent with, the Class Principal Balances indicated: Class Original Class Notional Balance Represents Approximately AI  ........ $177,857,383     599.9999831326% of AO (PAC Class) HI  ........ 52,499,758     599.9999771428% of HO (SUP Class) KI  ........ 23,673,856 800% of KO (SUP Class) PI   ........ 81,326,144 800% of PO (PAC Class) SC  ........ 24,334,096     349.9999928084% of CO (SC/PT Class) SE  ........ 85,031,504     599.9999717752% of EO (PAC Class) SG ........ 10,000,000 100% of FG (PT Class) SM ........ 105,000,000 100% of FM (PT Class) SN ........ 230,357,141     99.9999995659% of FD, FE, FH and FT (SEQ Classes) SU ........ 77,365,906     599.9999844893% of UO (PAC Class) SV  ........ 22,634,093     599.9999734913% of VO (SUP Class) TS  ........ 99,999,999    99.999999% of FK (PT Class) WS ........ 24,968,495     599.9999759697% of WO (SUP Class) YS  ........ 109,999,999     99.9999990909% of FL (PT Class) Tax Status:  Double REMIC Series. See "Certain Federal Income Tax Consequences" in this Supplement and in the Base Offering Circular. Regular and Residual Classes:  Class RR is a Residual Class and includes the Residual Interest of the Issuing REMIC and the Pooling REMIC; all other Classes of REMIC Securities are Regular Classes. B-16