rn a  
map containing all pairs produced.</td></tr>
<tr><td valign="top"><a href="#ukeymerge-3">ukeymerge/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="#ukeysort-2">ukeysort/2</a></td><td>
  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.</td></tr>
<tr><td valign=