-lemma lsubd_ldrop_O1_trans: ∀h,g,G,L1,L2. G ⊢ L1 ▪⊑[h, g] L2 →
- ∀K2,e. ⇩[0, e] L2 ≡ K2 →
- ∃∃K1. G ⊢ K1 ▪⊑[h, g] K2 & ⇩[0, e] L1 ≡ K1.
+lemma lsubd_drop_O1_trans: ∀h,g,G,L1,L2. G ⊢ L1 ⫃▪[h, g] L2 →
+ ∀K2,s,e. ⬇[s, 0, e] L2 ≡ K2 →
+ ∃∃K1. G ⊢ K1 ⫃▪[h, g] K2 & ⬇[s, 0, e] L1 ≡ K1.