README

<!--info-header-start--><h1>Number Range </h1><blockquote><p>by AaronGuo <a href="https://github.com/HongxuanG" target="_blank">@HongxuanG</a></p></blockquote><p><a href="https://tsch.js.org/8640/play" target="_blank"></a> </p><!--info-header-end-->

Sometimes we want to limit the range of numbers... For examples.

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