proposition: Lemma _paco_pre7: forall T0 T1 T2 T3 T4 T5 T6 (gf: rel7 T0 T1 T2 T3 T4 T5 T6) x0 x1 x2 x3 x4 x5 x6 (X: let gf' := gf in gf' x0 x1 x2 x3 x4 x5 x6), gf x0 x1 x2 x3 x4 x5 x6.
proof: Proof. intros; apply X. Defined.