Inductive pl_path_true : pl_path -> Map bool -> Prop :=
  | plp_true_nil : forall m : Map bool, pl_path_true pl_path_nil m
  | plp_true_cons :
      forall (m : Map bool) (a : ad) (pl : pl_path),
      pl_path_true pl m ->
      MapGet bool m a = Some true -> pl_path_true (pl_path_cons a pl) m.Inductive pl_path_true : pl_path -> Map bool -> Prop :=
  | plp_true_nil : forall m : Map bool, pl_path_true pl_path_nil m
  | plp_true_cons :
      forall (m : Map bool) (a : ad) (pl : pl_path),
      pl_path_true pl m ->
      MapGet bool m a = Some true -> pl_path_true (pl_path_cons a pl) m.Inductive pl_path_true : pl_path -> Map bool -> Prop :=
  | plp_true_nil : forall m : Map bool, pl_path_true pl_path_nil m
  | plp_true_cons :
      forall (m : Map bool) (a : ad) (pl : pl_path),
      pl_path_true pl m ->
      MapGet bool m a = Some true -> pl_path_true (pl_path_cons a pl) m.Definition pl_non_empty_path_true_def_0 (pl : pl_path) 
  (p : prec_list) : Prop :=
  forall m : Map bool,
  pl_path_incl pl p -> pl_path_true pl m -> pl_non_empty m p = true.

Lemma pl_non_empty_path_true_rev : forall (p : prec_list) (m : Map bool), pl_non_empty m p = true -> exists plp : pl_path, pl_path_incl plp p /\ pl_path_true plp m.