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<!DOCTYPE html>
<style>
table {
border: 5px solid green;
border-collapse: collapse;
}
td {
width: 50px;
height: 50px;
border: 1px solid red;
}
</style>
<p>There should be a square with a green border, not a red border.
</p>
<table>
<tr>
<td></td>
</tr>
</table>