: top;">&nbsp;&nbsp; <span
 style="font-style: italic;">CHECK_HYPERGRAPH</span><br>
      </td>
      <td style="vertical-align: top;">Check if input data is valid.
(Slows performance;intended for debugging.)<br>
      </td>
    </tr>
    <tr>
      <td style="vertical-align: top;"><span style="font-style: italic;">&nbsp;&nbsp;&nbsp;
PHG_OUTPUT_LEVEL</span><br>
      </td>
      <td style="vertical-align: top;">Level of verbosity; 0 is silent.<br>
      </td>
    </tr>
    <tr>
      <td style="vertical-ali