FDL > PVS > Graphs > subgraphs > subgraph TCC3 > pf:subgraph TCC3 > 1 > 2 > 1 > 2

Conclusion

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