-#R #L1 #T1 #T2 * #x #n #f1 #f2 #Hf1 #Hf2 #Hn #Hf #L2 #HL12
-lapply (lveq_inj_length … Hn ?) // #H destruct
-
-
- Hn : (L1≋ⓧ*[n,n]L1) (L1⊢𝐅*⦃T1⦄≡f1) →
-
-lapply (lfxs_inv_frees … HL12 … Hf2) -HL12 -Hf2 #HL12
-@(ex2_intro … Hf1) -Hf1
-@(sle_lexs_trans … HL12) -HL12 //
-
+#R #L1 #T1 #T2 * #n1 #n2 #f1 #f2 #Hf1 #Hf2 #Hn #Hf #L2 #HL12
+elim (lveq_inj_length … Hn ?) // #H1 #H2 destruct