proposition: Lemma CPlus_catC : forall l1 l2, CPlus (l1++l2) =i CPlus (l2++l1).
proof: Proof. move => l1 l2 u. rewrite !CPlus_cat. by rewrite orbC. Qed.
imports: Coq(RelationClasses Setoid Morphisms) HB(structures) mathcomp(ssreflect ssrfun ssrbool eqtype ssrnat seq fintype) mathcomp(bigop path) RegLang(languages) RegexpBrzozowski(glue regexp finite_der equiv)