-* #b #n * #Hb #Hn #Ht1 #Ht2
-@(ex1_2_intro ā¦ (āb) (āāāqā)) @and4_intro
-[ //
-| #g <lift_rmap_structure <depth_structure
- >tr_pushs_swap <tr_pap_pushs_le //
-| lapply (in_comp_lift_bi f ā¦ Ht1) -Ht1 -H0t1 -Hb -Ht2
- <lift_path_d_empty_dx //
-| lapply (lift_term_eq_repl_dx f ā¦ Ht2) -Ht2 #Ht2
+* #n * #H1n #Ht1 #Ht2
+@(ex_intro ā¦ (āāq)) @and3_intro
+[ -H0t1 -Ht1 -Ht2
+ >structure_L_sn >structure_reverse
+ >H1n in ā¢ (??%?); >path_head_structure_depth <H1n -H1n //
+| lapply (in_comp_unwind2_path_term f ā¦ Ht1) -Ht2 -Ht1 -H0t1
+ <unwind2_path_d_dx >(list_append_rcons_sn ā¦ p) <reverse_append
+ lapply (unwind2_rmap_append_pap_closed f ā¦ (pāš)į“æ ā¦ H1n) -H1n
+ <reverse_lcons <depth_L_dx #H2n
+ lapply (eq_inv_ninj_bi ā¦ H2n) -H2n #H2n <H2n -H2n #Ht1 //
+| lapply (unwind2_term_eq_repl_dx f ā¦ Ht2) -Ht2 #Ht2