-lemma cpds_inv_lift1: ∀h,g,G. l_deliftable_sn (cpds h g G).
-#h #g #G #L #U1 #U2 * #U #l1 #l2 #Hl12 #Hl1 #HU1 #HU2 #K #s #d #e #HLK #T1 #HTU1
+lemma cpds_inv_lift1: ∀h,g,G,l. l_deliftable_sn (cpds h g l G).
+#h #g #G #l2 #L #U1 #U2 * #U #l1 #Hl21 #Hl1 #HU1 #HU2 #K #s #d #e #HLK #T1 #HTU1