-lemma snv_fwd_lstas: ∀h,g,G,L,T. ⦃G, L⦄ ⊢ T ¡[h, g] →
- ∀l. ∃U. ⦃G, L⦄ ⊢ T •*[h, l] U.
-#h #g #G #L #T #H #l elim (snv_fwd_aaa … H) -H
-#A #HT elim (aaa_lstas h … HT l) -HT /2 width=2 by ex_intro/
+lemma snv_fwd_lstas: ∀h,o,G,L,T. ⦃G, L⦄ ⊢ T ¡[h, o] →
+ ∀d. ∃U. ⦃G, L⦄ ⊢ T •*[h, d] U.
+#h #o #G #L #T #H #d elim (snv_fwd_aaa … H) -H
+#A #HT elim (aaa_lstas h … HT d) -HT /2 width=2 by ex_intro/