@prefix log: <http://www.w3.org/2000/10/swap/log#>.
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#>.
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.

{?C rdfs:subClassOf ?D. ?X a ?C} => {?X a ?D}.
{?C rdfs:subClassOf ?D. ?D rdfs:subClassOf ?E} => {?C rdfs:subClassOf ?E}.