proposition: Lemma nf_b : forall a b n c, nf (gcons a b n c) -> nf b.
proof: Proof. inversion_clear 1;auto. Qed.
imports: Coq(Arith List Lia Compare_dec Relations Wellfounded RelationClasses) hydras(Epsilon0) hydras(More_Arith Restriction) hydras(ON_Generic) hydras(rpo.term rpo.rpo) hydras(T2) hydras(Compat815)