intros x0 p z; case z; auto.
intros H'0; inversion H'0.
intros x0 y0 p q H'0 z H'1; simple inversion H'1.
discriminate H.
rewrite <- H1.
intros H'2; try assumption.
apply ltP_hd; auto.
apply ltT_trans with (y := y0); auto.
injection H0.
intros H'3 H'4; rewrite <- H'4; auto.
rewrite <- H2.
intros H'2 H'3; apply ltP_hd; auto.
apply ltT_eqTl with (a := x1); auto.
injection H1.
intros H'4 H'5; rewrite H'5; auto.
intros x0 y0 p q H'0 H'1 H'2 z H'3; simple inversion H'3.
discriminate H.
rewrite <- H1; auto.
intros H'4; apply ltP_hd; auto.
apply ltT_eqTr with (a := y0).
apply (eqT_sym A n); auto.
injection H0.
intros H'5 H'6; rewrite <- H'6; auto.
rewrite <- H2.
intros H'4 H'5; apply ltP_tl; auto.
apply (eqT_trans A n) with (y := x1); auto.
injection H1.
intros H'6 H'7; rewrite H'7; auto.
apply H'2; auto.
injection H1.
intros H'6; rewrite <- H'6; auto.
Qed.

Theorem olist_pX_ltP : forall a p, olist (pX a p) -> ltP p (pX a pO).
intros a p; case p; auto.