          <td> const</td>
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<p>Return true if B is included in this box. </p>
<dl class="section note"><dt>Note</dt><dd><ol type="1">
<li>An empty box contains nothing.</li>
<li>A non-empty box contains any empty box.</li>
</ol>
</dd></dl>
<dl class="section see"><dt>See also</dt><dd><a class="el" href="structtgx_1_1_box3.html#a9c