induction 1; intuition; simpl in *.
inversion H1; clear H1; subst.
econstructor.
inversion H1; clear H1; subst.
inversion H0; clear H0; subst.
eauto.
inversion H2; clear H2; subst.
inversion H3; clear H3; subst.
econstructor.
eapply IHdat_better1; eauto; omega.
eapply IHdat_better2; eauto; omega.
Qed.

Lemma dat_bind_2_better : forall (n : nat) (A B : Set)(c1 : Comp B)(c2 : B -> Comp A) t1 t2,
dat_correct_bind2 c1 c2 n t1 ->
dat_correct_bind c1 c2 n t2 ->
dat_better t1 t2.