erase_tm lc_tm_open_tm_wrt_co_erase_tm : lc.

(* ----- automation ---------- *)

(* TODO *)
Hint Rewrite open_co_erase_tm open_co_erase_tm2 open_tm_erase_tm : TODO.
Hint Resolve lc_erase binds_map_2.

destruct a. simpl. rewrite IHG. eauto.