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<!DOCTYPE html>
<html>
<head>
<head>
<style>
table table
{ border-collapse: collapse; border-style: solid; border-width: 10px;
border-color: green }
</style>
</head>
</head>
<body>
<table><tr>
<td>
<table>
<tr><td></td></tr>
</table>
<table>
<tr><td></td></tr>
</table>
</td>
</tr></table>
</body>
</html>