proposition: Lemma Rquo'_dec x y : {Rquo' x y} + {~Rquo' x y}.
proof: Proof. unfold Rquo'; intros; destruct (eq_nat_dec x y); destruct (Rquo_dec x y); auto; right; tauto. Defined.
imports: Coq(Permutation Multiset Heap PermutSetoid) CoLoR(AdjMat RelUtil ListExtras LogicUtil VecUtil NatUtil RelSub Path SortUtil ListNodup OptUtil BoundNat SCC SCC_dec Total)