Base Offering Circular – Multifamily 482090 56 APPENDIX I July 1, 2001 CLASS TYPES The following list contains abbreviated definitions that do not describe all of the characteristics of the listed Class Types.  These definitions are not intended as descriptions of the material risks associated with any Class.  For discussion of such risks, investors should see “Risk Factors—Class Investment Considerations” in the related Offering Circular Supplement. Standard Abbreviation Category of Class Definition PRINCIPAL TYPES AD Accretion Directed Classes (1) that are designed to receive principal distributions from interest accretions on specified Partial Accrual or Accrual Classes and (2) that, on the basis of such structure, exhibit stable Weighted Average Lives from 0% of the assumed prepayment rate of the applicable prepayment model to either (a) the pricing percentage of the assumed prepayment rate of the applicable prepayment model or (b) a percentage of the assumed prepayment rate of the applicable prepayment model that, although lower than such pricing percentage, is close enough to satisfy Ginnie Mae.  These Classes also may receive principal payments from principal paid in respect of Trust Assets. CC Callable Class Classes that are designed to receive payments based on distributions on Underlying Callable Securities. CPT Component Classes consisting of “Components.” The Components of a Component Class may have different principal and/or interest distribution characteristics but together constitute a single Class and are not separately transferable from the related Class.  Each Component may be categorized according to one or more Class Types. NPR No Payment Residual Classes that are designed to receive no residual distributions of principal. NSJ Non-Sticky Jump Classes for which the principal distribution priorities change temporarily upon the occurrence of one or more “trigger” events. A Non-Sticky Jump Class “jumps” to its new priority on each Distribution Date when the trigger condition is met and reverts to its original priority (i.e., does not “stick” to the new priority) on each Distribution Date when the trigger condition is not met.