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<!DOCTYPE html>
<meta charset="utf-8">
<style>
div {
width: 10ch;
border: 2px solid blue;
line-height: 1;
}
.ideo > div {
width: 1em;
}
</style>
<body>
<section>
<div>12345<br>67890</div>
<div>12345<br>67890</div>
<div>12345<br>67890</div>
<div>12345<br>67890</div>
<div>12345<br>67890</div>
<div>12345<br>67890</div>
</section>
<section class="ideo">
<div>国<br>国</div>
<div>国<br>国</div>
</section>
</body>