#G #L #K #T #U #e #HLK #HTU elim (eq_or_gt e)
/3 width=5 by fqu_drop_lt, or_introl/ #H destruct
>(drop_inv_O2 … HLK) -L >(lift_inv_O2 … HTU) -T //
#G #L #K #T #U #e #HLK #HTU elim (eq_or_gt e)
/3 width=5 by fqu_drop_lt, or_introl/ #H destruct
>(drop_inv_O2 … HLK) -L >(lift_inv_O2 … HTU) -T //