><a href="#keymerge-3">keymerge/3</a></td><td>
  Returns the sorted iterator formed by merging <code>TupleIterator1</code> and
  <code>TupleIterator2</code>.</td></tr>
<tr><td valign="top"><a href="#keyreplace-4">keyreplace/4</a></td><td>
  Returns a copy of <code>TupleIterator1</code> where the first occurrence of a T
  tuple whose <code>N</code>th element compares equal to <code>Key</code> is replaced with
  <code>NewTuple</code>, if there is such a tuple <code>T</code>.</td></tr>
<tr><td valign="top"><a 