(<=> (Product ?X) (Or (Exists (?Sale) (Product-Sold ?Sale ?X)) (Exists (?For-Sale) (Product-For-Sale ?For-Sale ?X))))
(Inherited-Facet-Value Slot-Value-Type For-Sale Product-For-Sale Eo-Entity) (Inherited-Facet-Value Slot-Cardinality For-Sale Product-For-Sale 1)