. the certificates were issued in seven separate classes , comprised of class a-fx , class a-fl , class b , class c , class d , class e and class f . each of the certificates in classes b , c , d , e and f are subordinated in right of payment to any other class of certificates which has an earlier alphabetical designation . the certificates were issued with terms identical to the loan except for the class a-fl certificates , which bear interest at a floating .