</code> with each element <code>H</code> replaced by a
  tuple of form <code>{I, H}</code> where <code>I</code> is the position of <code>H</code> in
  <code>Iterator1</code>.</td></tr>
<tr><td valign="top"><a href="#enumerate-2">enumerate/2</a></td><td>
  Returns elements of <code>Iterator1</code> with each element <code>H</code> replaced by a
  tuple of form <code>{I, H}</code> where <code>I</code> is the position of <code>H</code> in
  <code>Iterator1</code>.</td></tr>
<tr><td valign="top"><a href="#filte