proposition: Lemma same_relation_list_symm: forall {A} (rs1 rs2: list (relation A)), same_relation_list rs1 rs2 -> same_relation_list rs2 rs1.
proof: Proof. intros. induction H; constructor. + symmetry; auto. + auto. Qed.
imports: Coq.Classes.Morphisms Coq.Lists.List CertiGraph.lib.Coqlib CertiGraph.lib.List_ext CertiGraph.lib.List_Func_ext CertiGraph.lib.Relation_ext