><tt>TupleIterator2 = <a href="#type-iterator">iterator</a>(Elem)</tt></li><li><tt>Elem = tuple()</tt></li></ul></p>
<p> </p>
</div><p><p>
  Returns a iterator containing the sorted elements of iterator
  <code>TupleIterator1</code> where all except the first tuple of the tuples
  comparing equal have been deleted. Sorting is performed on the
  <code>N</code>th element of the tuples.</p>
 
  The iterator is fully evaluated, infinite iterators will never
  return.</p>

<h3 class="function"><a name="umerge-1"