#h #g #I #G #K1 #V #i #d #Hdi #H @(csx_ind_alt … H) -V
#V0 #_ #IHV0 #K2 #H @(lsx_ind … H) -K2
#K0 #HK0 #IHK0 #HK10 #L0 #HLK0 @lsx_intro
-#L2 #HL02 #HnL02 elim (lpx_ldrop_conf … HLK0 … HL02) -HL02
+#L2 #HL02 #HnL02 elim (lpx_drop_conf … HLK0 … HL02) -HL02
#Y #H #HLK2 elim (lpx_inv_pair1 … H) -H
#K2 #V2 #HK02 #HV02 #H destruct
elim (eq_term_dec V0 V2) #HnV02 destruct [ -IHV0 -HV02 -HK0 | -IHK0 -HnL02 -HLK0 ]
[ #i #HG #HL #HT #H #d destruct
elim (lt_or_ge i (|L|)) /2 width=1 by lsx_lref_free/
elim (ylt_split i d) /2 width=1 by lsx_lref_skip/
- #Hdi #Hi elim (ldrop_O1_lt (Ⓕ) … Hi) -Hi
+ #Hdi #Hi elim (drop_O1_lt (Ⓕ) … Hi) -Hi
#I #K #V #HLK lapply (csx_inv_lref_bind … HLK … H) -H
/4 width=6 by lsx_lref_be, fqup_lref/
| #a #I #V #T #HG #HL #HT #H #d destruct