ams"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">tail</td><td>the index of the tail node. </td></tr>
    <tr><td class="paramname">head</td><td>the index of the head node. </td></tr>
    <tr><td class="paramname">literal</td><td>it will be set to true if the arc is selected. </td></tr>
  </table>
  </dd>
</dl>

</div>
</div>
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