fact: Fixpoint prefixes {A: Type} (l: list A): list (list A) := match l with | nil => nil | a :: l0 => nil :: map (cons a) (prefixes l0) end.
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