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Test Info:

<style>
.b {
font-size: 0.0136in;
writing-mode: tb;
}
* {
column-count: 7;
width: 7pt;
}
</style>
<script>
function go() {
a.style.setProperty("column-span", "all")
}
</script>
<body onload=go()>
<q>
<ins class="b">
<pre></pre>
<q id="a">A</q>
</ins>
<!-- a -->