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<!DOCTYPE html>
<html>
<head>
<style>
td {
width: 20px;
height: 20px;
background-color: green;
}
table {
border-collapse:separate;
border-spacing: 0px;
}
</style>
</head>
<body>
<table>
<tr>
<td></td>
<td style="background-color: blue"></td>
<tr>
<td></td>
<td></td>
</tr>
</table>
</body>
</html>