uments</h2>
    <table class="ref-arguments">
    <colgroup><col class="name" /><col class="desc" /></colgroup>
    <tr>
      <th>x</th>
      <td><p>x  an unorderd map object, such as a <code>hashmap</code> or
<code>multimap</code></p></td>
    </tr>
    <tr>
      <th>i</th>
      <td><p>a vector of keys</p></td>
    </tr>
    <tr>
      <th>value</th>
      <td><p>a vector of values for the keys</p></td>
    </tr>
    </table>


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