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<p>Move iterator to previous in-order key. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">it</td><td>Iterator to retreat </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>1 if moved to a valid element, 0 if now before begin </dd></dl>

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