Base Offering Circular - Multifamily 482090 55 Standard Abbreviation Category of Class Definition PAC PAC (or Planned Amortization Class) Classes that are designed to receive distributions of principal using a predetermined schedule derived by assuming two constant prepayment rates for the Mortgage Loans.  These two rates are the endpoints for the “structuring range” for the PAC Class. The endpoints must be at least 30 percentage points above and below the pricing speed.  The PAC Classes in any Series or Security Group may be subdivided into different categories (e.g., PAC I, PAC II) having different structuring ranges.  The structuring range for a PAC I Class of a Series or Security Group usually is wider than the structuring range for a PAC II Class of such Series or Security Group, as applicable. PT Pass-Through Classes that either individually or together with other Classes receive on each Distribution Date all or substantially all of the principal payments received on the related Ginnie Mae Multifamily Certificates and that are not Strip or Sequential Pay Classes. SC Structured Collateral Classes that are designed to receive payments based on distributions of Underlying Certificates. SCH Scheduled Classes that are designed to receive distributions of principal using a predetermined schedule, but that do not fit the definitions of PAC or TAC Classes. SEQ Sequential Pay Classes that receive distributions of principal in a prescribed sequence, that do not have predetermined schedules and that generally are designed to receive distributions of principal continuously from the first Distribution Date on which they receive principal until they are retired. Sequential Pay Classes may receive principal distributions concurrently with one or more other Sequential Pay Classes. SJ Sticky Jump Classes for which the principal distribution priorities change permanently upon the occurrence of one or more “trigger” events. A Sticky Jump Class “jumps” to its new priority on the first Distribution Date when the trigger condition is met and retains (“sticks” to) that priority until retired. STP Strip Classes that receive a constant proportion, or “strip,” of the principal payments on the underlying Ginnie Mae Multifamily Certificates. SUP Support (or Companion) Classes that receive distributions of principal on any Distribution Date only if scheduled payments have been made on specified PAC, TAC and/or Scheduled Classes. TAC TAC (or Targeted Amortization Class) Classes that are designed to receive distributions of principal using a predetermined schedule derived by assuming a single constant prepayment rate for the Mortgage Loans underlying the Ginnie Mae Multifamily Certificates.