- | #T2 #HT12 #HT2 #H destruct -IHV1
- /4 width=8 by lpx_pair, aaa_inv_lifts, drops_refl, drops_drop/
+ | #X1 #HXT1 #HX1 #H destruct -IHV1
+ elim (cpx_lifts_sn … HX1 (Ⓣ) … (L1.ⓓV1) … HXT1) -X1
+ /4 width=7 by lpx_pair, aaa_inv_lifts, drops_refl, drops_drop/