proposition: Lemma sub_nonterminals_listT_remove ls ps : sub_nonterminals_listT (remove_nonterminal ls ps) ls.
proof: Proof. intros p. apply remove_nonterminal_1. Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.Classes.RelationClasses Coq.Setoids.Setoid Coq.ZArith.ZArith Fiat.Parsers.ContextFreeGrammar.Core Fiat.Parsers.BaseTypes