proposition: Lemma prefixes_app_1: forall {A: Type} (l: list A) (a: A), prefixes (l +:: a) = prefixes l +:: l.
proof: Proof. intros. induction l; auto. simpl. rewrite IHl. rewrite map_app. auto. Qed.
imports: Coq.Lists.List Coq.micromega.Lia Coq.Sorting.Permutation Coq.ZArith.ZArith_base Coq.ZArith.Zcomplements Coq.Logic.FunctionalExtensionality CertiGraph.lib.Coqlib CertiGraph.lib.EquivDec_ext VST.zlist.sublist VST.zlist.list_solver