pty-0">empty/0</a></td><td></td></tr>
<tr><td valign="top"><a href="#fold-3">fold/3</a></td><td></td></tr>
<tr><td valign="top"><a href="#from_list-1">from_list/1</a></td><td></td></tr>
<tr><td valign="top"><a href="#get_root-1">get_root/1</a></td><td></td></tr>
<tr><td valign="top"><a href="#insert-4">insert/4</a></td><td></td></tr>
<tr><td valign="top"><a href="#is_empty-1">is_empty/1</a></td><td></td></tr>
<tr><td valign="top"><a href="#lookup-2">lookup/2</a></td><td></td></tr>
<tr><td valign="top"><a hr