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<table border=1>
<thead><tr><td>Name</td><td>Week1</td><td>Week2</td><td>Week3</td></tr></thead>
<tbody>
<tr><td>abc</td><td colspan=3><div id=div1 style="width:100%"/></td></tr>
<tr><td>def</td><td colspan=3><div id=div2 style="width:100%"/></td></tr>
</tbody>
</table>
<table border=1>
<thead><tr><td>Name</td><td>Week1</td><td>Week2</td><td>Week3</td></tr></thead>
<tbody>
<tr><td>abc</td><td> </td><td> </td><td> </td></tr>
<tr><td>def</td><td> </td><td> </td><td> </td></tr>
</tbody>
</table>