README

<!--info-header-start--><h1>Appear only once </h1><blockquote><p>by X.Q. Chen <a href="https://github.com/brenner8023" target="_blank">@brenner8023</a></p></blockquote><p><a href="https://tsch.js.org/9898/play" target="_blank"></a> &nbsp;&nbsp;&nbsp;<a href="./README.zh-CN.md" target="_blank"></a> </p><!--info-header-end-->

Find the elements in the target array that appear only once. For example：input: [1,2,2,3,3,4,5,6,6,6]，output: [1,4,5].

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