(<=> (Attribute-Function-Total-On ?Function ?Class) (And (Attribute-Function ?Function) (Class ?Class) (Total-On ?Function ?Class)))
(=> (Attribute-Function-Total-On $X $Y) (Class $Y)) (=> (Attribute-Function-Total-On $X $Y) (Attribute-Function $X)) (<=> (Attribute-Function-Total-On ?Function ?Class) (And (Attribute-Function ?Function) (Class ?Class) (Total-On ?Function ?Class)))