proposition: Lemma fin_nf (i:nat) : nf (fin i).
proof: Proof. destruct i; red; now cbn. Qed.
imports: hydras(T1 E0 Comparable) Coq(Arith Logic.Eqdep_dec Peano_dec List Bool Recdef Lia Wellfounded.Inverse_Image Wellfounded.Inclusion RelationClasses )