fact: Variable (P : list X -> list X -> Type) (IHP : forall l m, (forall l' m', strict_suffix l' m' l m -> P l' m') -> P l m).
imports: List Undecidability.PCP.PCP Undecidability.PCP.Util.Facts Undecidability.Synthetic(Definitions DecidabilityFacts EnumerabilityFacts MoreEnumerabilityFacts ListEnumerabilityFacts) Coq.Init.Wf Undecidability.Shared.Libs.DLW.Utils(utils_tac utils_list utils_nat finite)