n the tree.</td></tr>
<tr><td valign="top"><a href="#get_node-2">get_node/2</a></td><td>
  Finds a node by using its placeholder.</td></tr>
<tr><td valign="top"><a href="#get_pair_tuple-1">get_pair_tuple/1</a></td><td>
  Splits a node pair into the original two nodes.</td></tr>
<tr><td valign="top"><a href="#get_parent-2">get_parent/2</a></td><td>
  Returns the parent of Node in the Tree.</td></tr>
<tr><td valign="top"><a href="#get_ph-1">get_ph/1</a></td><td>
  Returns the placeholder for a node or node pa