fact: Variable (X : Type) (R : X -> X -> Prop) (Rper : per R) (Rdec : dec R) (l : list X) (Hl : forall x, In x l -> R x x).
imports: List Arith Lia Permutation Undecidability.Shared.Libs.DLW.Utils(utils_list utils_decidable fin_base) Undecidability.Shared.Libs.DLW.Vec(pos vec) Undecidability.Shared.Libs.DLW.Wf(measure_ind)