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<style>
#c {
margin-right: 24vmin;
}
#b {
column-count: 1;
max-width: 18%;
writing-mode: tb;
}
#a {
translate: 0px 9px 0px;
white-space: pre-line;
}
</style>
<fieldset id="a">
<fieldset id="b">
<select id="c">a</select>