Test it
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<script>alert('test')</script>
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<url=http://www.phpbb.com/>Visit phpBB!</url><br /><a href="http://www.phpbb.com/" target="_blank">Visit phpBB!</a>
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[iframe src="http://free.timeanddate.com/clock/i42c4p4x/n2578" frameborder="0" width="82" height="18"][/iframe]