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 IB..................    $  9,918,000 20% of PB (PAC I Class) IC..................    $  3,781,000 10% of PC (PAC I Class) IT ..................    $45,225,000 50% of PA and PB (in the aggregate) (PAC I Classes) PI ..................    $20,430,000 50% of PA (PAC I Class) Tax Status: Single REMIC Series. See "Certain Federal Income Tax Consequences" in this Supplement and in the Base Offering Circular. Regular and Residual Classes: Class R is a Residual Class and includes the Residual Interest of the Trust REMIC; all other Classes of REMIC Securities are Regular Classes. B-19