Slice(Distinct(Project(OrderBy(Union(Filter((?term1 != ?term2) && (lcase(str(?term1) )  = lcase(str(?term2) ) ) && (?g1 != ?g2),
                                            Join(Graph(?g2,
                                                 BGP( ?term2 ?a <http://www.w3.org/1999/02/22-rdf-syntax-ns#Property>)),
                                            Graph(?g1,
                                            BGP( ?term1 ?a <http://www.w3.org/2000/01/rdf-schema#Class>)))),
                                     BGP( ?s ?p ?o)), (?term1)),
                       {?term1, ?g1, ?g2})),
      0,
      1000)