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Test Info:
<!DOCTYPE html>
<html>
<head></head>
<body><div style="column-width: 1px;"><div style="height: 5em;"><div style="height: 1em;"></div><div style="height: 5em; float: right;"></div></div><div style="height: 1em;"></div><div style="float: right;"></div><div style="float: left; height: 5em;"></div></div></body>
</html>