Conclusion 1. subset?({e:doubleton[T] | edges(G!1)(e) AND (FORALL x:T : e(x) IMPLIES V!1(x))}, edges(G!1)) 2. is finite[doubleton[T]]({e:doubleton[T] | edges(G!1)(e) AND (FORALL x:T : e(x) IMPLIES V!1(x))})