Given a concept, a relation and a qualifier,return the cardinality of the corresponding role.
Note that cardinality only exists if the min and max are the same.
(Nth-Domain Qualified-Role-Cardinality 3 Unary-Relation) (Nth-Domain Qualified-Role-Cardinality 2 Relation) (Nth-Domain Qualified-Role-Cardinality 1 Unary-Relation) (<=> (Qualified-Role-Cardinality ?A ?B ?C ?D) (And (Qualified-Role-Min-Cardinality ?A ?B ?C ?D) (Qualified-Role-Max-Cardinality ?A ?B ?C ?D)))