intro.
simple induction s; intros.
inversion_clear H0.
simple inversion H0.
simple inversion H1.
elim H4; elim H7; trivial.
injection H8; injection H3.
intros.
elim H12.
try rewrite H7; try rewrite <- H2; try rewrite H6; try rewrite <- H11; auto.
try rewrite H4.
simple inversion H1.
intros.
elim H8.
injection H5; injection H3; intros.
try rewrite <- H2; try rewrite H11; try rewrite <- H13; auto.
try rewrite H7.
injection H8; injection H5.
intros HH1 HH2 HH3.
try rewrite HH1; try rewrite HH3.
try rewrite <- H6; try rewrite <- H9.
intros.
elim (H C1 C0 H12 H10).
trivial.
Qed.
(*****************************************************************************)

(* Specifications: *)
Lemma Squelet : forall e : MLenv, exists s : Squelette, Habite e s.
intro.