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<?xml version="1.0"?>
<window xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" onload="addStyleSheet('window { display: table; }');">
<script type="text/javascript">
function addStyleSheet(text)
{
sheet.appendChild(document.createTextNode(text));
document.documentElement.appendChild(sheet);
}
</script>
<treecols/>
</window>