∀A1. ⦃G1, L1⦄ ⊢ T1 ⁝ A1 → ∃A2. ⦃G2, L2⦄ ⊢ T2 ⁝ A2.
#G1 #G2 #L1 #L2 #T1 #T2 #H elim H -G1 -G2 -L1 -L2 -T1 -T2
[ #I #G #L #T #A #H elim (aaa_inv_lref … H) -H
- #J #K #V #H #HA lapply (ldrop_inv_O2 … H) -H
+ #J #K #V #H #HA lapply (drop_inv_O2 … H) -H
#H destruct /2 width=2 by ex_intro/
| * [ #a ] * #G #L #V #T #X #H
[ elim (aaa_inv_abbr … H)