k if the priority queue type is as expected.</a></h4>
  O(1).</td></tr>
<tr><td valign="top"><a href="#join-2">join/2</a></td><td>
  <h4><a name="Join_two_priority_queues.">Join two priority queues.</a></h4>
  O(N).</td></tr>
<tr><td valign="top"><a href="#len-1">len/1</a></td><td>
  <h4><a name="Determine_the_length_of_a_priority_queue.">Determine the length of a priority queue.</a></h4>
  O(N).</td></tr>
<tr><td valign="top"><a href="#new-0">new/0</a></td><td>
  <h4><a name="Create_a_new_priority_queue.">