elim (lsuba_inv_pair1 … H) -H * #K2
[ #HK12 #H destruct /3 width=5 by aaa_lref/
| #W0 #V0 #A0 #HV0 #HW0 #_ #H1 #H2 #H3 destruct
elim (lsuba_inv_pair1 … H) -H * #K2
[ #HK12 #H destruct /3 width=5 by aaa_lref/
| #W0 #V0 #A0 #HV0 #HW0 #_ #H1 #H2 #H3 destruct