set the colspan or rowspan properties of the cell (td).
example
<table border="3">
<tr>
<td colspan="2">A1</td>
<td>A3</td>
</tr>
<tr>
<td>B1</td>
<td>B2</td>
<td>B3</td>
</tr>
<tr>
<td rowspan="2">C1</td>
<td>C2</td>
<td>C3</td>
</tr>
<tr>
<td>D2</td>
<td>D3</td>
</tr>
</table>
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