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        <td colspan="3"><font face="verdana" size="-1"><strong>CodeForces 预定义变量列表</strong></font></td>
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            <nobr><font face="verdana" size="-2"><strong>${beginRegion}</strong></font></nobr>
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        <td width="10">&nbsp;</td>
        <td width="100%" valign="top"><font face="ver