:- module(trees).
:- export map_tree / 4.
:- export tree_to_list / 2.
:- export tree_size / 2.
:- export put_label / 4.
:- export map_tree / 3.
:- export list_to_tree / 2.
:- export get_label / 3.
:- comment(map_tree / 4, hidden).