proposition: Lemma remove_nonterminal_6 ls ps : is_valid_nonterminal (remove_nonterminal ls ps) ps = false.
proof: Proof. apply remove_nonterminal_2; right; reflexivity. 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