simple induction 1; intros; auto with arith pts.
elim red_item with R' n (Def d T) e0 f; intros; auto with arith pts.
apply par_delta with d T; auto with arith pts.
elim item_trunc with decl n e0 (Def d T); intros; auto with arith pts.
elim H4 with x0; intros; auto with arith pts.
inversion_clear H6.
generalize H9.
inversion_clear H8; intros.
apply par_delta with d U; auto with arith pts.
Qed.

Lemma bd_par_red1_lift : R_lift bd_par_red1.
red in |- *.