proposition: Lemma length_le_trans {a b c : String} (H0' : length a < length b) (H1' : b ≤s c) : length a < length c.
proof: Proof. destruct H1'; setoid_subst. { etransitivity; eassumption. } { assumption. } Qed.
imports: Fiat.Common.Coq__8_4__8_5__Compat Coq.ZArith.ZArith Fiat.Common Fiat.Common.List.Operations Fiat.Common.List.ListFacts Fiat.Common.Le Fiat.Common.Tactics.SetoidSubst Fiat.Common.Tactics.IsClosed Fiat.Parsers.StringLike.Core Fiat.Common.UIP