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The "correct" way to add underline is probably just <em> or <em class="whatever">, as underline is very likely added for emphasis.
If the only way to emphasize in a book is with underlines, use <em> and set:
em {
font-style: normal;
text-decoration: underline;
}
If underlines cohabit with italics, bold, colors, etc. use <em class="whatever">.
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