<a href="#type-iterator">iterator</a>(A)</tt></li><li><tt>Iterator3 = <a href="#type-iterator">iterator</a>(B)</tt></li><li><tt>Iterator4 = <a href="#type-iterator">iterator</a>(C)</tt></li></ul></p>
<p> </p>
</div><p>
  "Unzips" a iterator of three-tuples into three iterators, where the first
  iterator contains the first element of each tuple, the second iterator
  contains the second element of each tuple, and the third iterator
  contains the third element of each tuple.</p>

<h3 class="function"><a nam