(* Forward lemmas with length for local environments ************************)
-lemma fquq_fwd_length_lref1: ∀G1,G2,L1,L2,T2,i. ⦃G1, L1, #i⦄ ⊐⸮ ⦃G2, L2, T2⦄ → |L2| ≤ |L1|.
-#G1 #G2 #L1 #L2 #T2 #i #H elim H -H [2: * ]
-/3 width=5 by fqu_fwd_length_lref1, lt_to_le/
+lemma fquq_fwd_length_lref1: ∀b,G1,G2,L1,L2,T2,i. ⦃G1, L1, #i⦄ ⊐⸮[b] ⦃G2, L2, T2⦄ →
+ |L2| ≤ |L1|.
+#b #G1 #G2 #L1 #L2 #T2 #i #H elim H -H [2: * ]
+/3 width=6 by fqu_fwd_length_lref1, lt_to_le/
qed-.