Class R Certificates All Certificates bearing the class designation of "Class R".
Class R-I Certificate Any one of the Class R-I Certificates executed by the Trustee and authenticated by the Certificate Registrar substantially in the form annexed hereto as Exhibit D and evidencing an interest designated as a "residual interest" in REMIC I for purposes of the REMIC Provisions.
Class R-II Certificate Any one of the Class R-II Certificates executed by the Trustee and authenticated by the Certificate Registrar substantially in the form annexed hereto as Exhibit D and evidencing an interest designated as a "residual interest" in REMIC II for purposes of the REMIC Provisions.
Class C Certificates Any one of the Class C Certificates executed by the Trustee, and authenticated and delivered by the Certificate Registrar, substantially in the form annexed hereto as Exhibit A-18, representing the right to distributions as set forth herein and therein and evidencing a regular interest in REMIC 4.
Class X Certificates All Certificates bearing the class designation of "Class X".