GraphLoader loader = new DefaultGraphLoader();
for( ATermAppl axiom : explanation ) {
prunedExplanation.remove( axiom );
copyKB = builder.build( prunedExplanation );
copyGraph = new PelletInfGraph( copyKB, (PelletReasoner) getReasoner(), loader );
if( !checkEntailment( copyGraph, pattern, false ) ) {
prunedExplanation.add( axiom );
}