Definition read id : Poram nat :=
  monad_map snd (read_access id).Definition write id v : Poram unit :=
  monad_map (fun _ => tt) (write_access id v).Definition triv {X} : X -> Prop :=
  fun _ => True.Definition pand {X} (P Q : X -> Prop) : X -> Prop :=
  fun x => P x /\ Q x.Definition poram_lift {X} (Pre Post : state -> Prop)
  (P : X -> Prop) : Poram X -> Prop :=
  state_plift
    (pand well_formed Pre)
    (pand well_formed Post)
    P.Definition state_plift2 {M} `{PredLift M} {S X Y}
  (Pre Post : S -> S -> Prop)
  (P : X -> Y -> Prop)
  (m1 : StateT S M X)
  (m2 : StateT S M Y) : Prop :=
  forall s1 s2,
    Pre s1 s2 ->
    plift2 (prod_rel P Post) (m1 s1) (m2 s2).Definition state_plift2_val {M} `{PredLift M} {S X Y}
  (Pre : S -> S -> Prop)
  (Post : S -> S -> X -> Y -> Prop)
  (m1 : StateT S M X)
  (m2 : StateT S M Y) : Prop :=
  forall s1 s2,
    Pre s1 s2 ->
    plift2 (fun '(x, s) '(y, s') => Post s s' x y) (m1 s1) (m2 s2).Definition poram_lift2 {X Y} (Pre Post : state -> state -> Prop)
  (P : X -> Y -> Prop) : Poram X -> Poram Y -> Prop :=
  state_plift2
    (fun s s' => well_formed s /\ well_formed s' /\ Pre s s')
    (fun s s' => well_formed s /\ well_formed s' /\ Post s s')
    P.Definition poram_lift2_val {X Y} (Pre : state -> state -> Prop)
  (Post : state -> state -> X -> Y -> Prop) : Poram X -> Poram Y -> Prop :=
  state_plift2_val
    (fun s s' => well_formed s /\ well_formed s' /\ Pre s s')
    (fun s s' x y => well_formed s /\ well_formed s' /\ Post s s' x y).

Lemma poram_lift2_bind {X Y X' Y'} (Pre Mid Post : state -> state -> Prop) (P : X -> Y -> Prop) (Q : X' -> Y' -> Prop) (m1 : Poram X) (m2 : Poram Y) (f1 : X -> Poram X') (f2 : Y -> Poram Y') : poram_lift2 Pre Mid P m1 m2 -> (forall x y, P x y -> poram_lift2 Mid Post Q (f1 x) (f2 y)) -> poram_lift2 Pre Post Q (mbind m1 f1) (mbind m2 f2).