All principal payments on the Notes shall be made, first, to the Class A Notes pro rata until the Class A Note Principal Amount has been paid in full, and then to the Class B Notes pro rata until the Class B Note Principal Amount has been paid in full.
Class B-5 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:
Class B Note Principal Balance means, on any date of determination, an amount equal to (a) the Class B Note Initial Principal Balance, minus (b) the aggregate amount of principal payments made to the Class B Noteholders on or prior to such date.
Class Principal Amount With respect to each Class of Certificates other than any Class of Notional Certificates, the aggregate of the Certificate Principal Amounts of all Certificates of such Class at the date of determination. With respect to each Class of Notional Certificates, zero.
Class P Principal Amount As of the Closing Date, $100.
Class B-4 Optimal Principal Amount As to any Distribution Date, an amount equal to the sum of (I) the sum, as to each Outstanding Mortgage Loan, of the product of (x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of: