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<!--info-header-start--><h1>IsAlphabet </h1><blockquote><p>by Kanon <a href="https://github.com/ysknsid25" target="_blank">@ysknsid25</a></p></blockquote><p><a href="https://tsch.js.org/35252/play" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.ja.md" target="_blank"></a> </p><!--info-header-end-->

Determine if the given letter is an alphabet.

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