href="#keysearch-3">keysearch/3</a></td><td>
  Searches the iterator of tuples <code>TupleIterator</code> for a tuple whose
  <code>N</code>th element compares equal to <code>Key</code>.</td></tr>
<tr><td valign="top"><a href="#keysort-2">keysort/2</a></td><td>
  Returns an iterator containing the sorted elements of iterator
  <code>TupleIterator1</code>.</td></tr>
<tr><td valign="top"><a href="#keystore-4">keystore/4</a></td><td>
  Returns a copy of <code>TupleIterator1</code> where the first occurrence of