Create a new priority queue.</a></h4>
  O(1).</td></tr>
<tr><td valign="top"><a href="#out-1">out/1</a></td><td>
  <h4><a name="Take_an_item_from_the_head_of_the_priority_queue.">Take an item from the head of the priority queue.</a></h4>
  O(1) amortized, O(N) worst case.</td></tr>
<tr><td valign="top"><a href="#out-2">out/2</a></td><td>
  <h4><a name="Take_an_item_of_a_specific_priority_from_the_head_of_the_queue.">Take an item of a specific priority from the head of the queue.</a></h4>
  O(1) amortized, O