pe-tree">tree()</a></tt><br></p>
</div><p>
  Creates a empty tree</p>

<h3 class="function"><a name="new_node_ph-1">new_node_ph/1</a></h3>
<div class="spec">
<p><tt>new_node_ph(PH::<a href="#type-tree_ph">tree_ph()</a>) -&gt; <a href="#type-tree_node">tree_node()</a></tt><br></p>
</div><p>
  Creates a node from a placeholder. See <a href="#get_child_ph-1"><code>get_child_ph/1</code></a>.</p>

<h3 class="function"><a name="replace_with_elements-3">replace_with_elements/3</a></h3>
<div class="spec">
<p><tt>re