it just works. no special machinery needed. the boolean operators distribute over derivatives the same way union does. derivatives are such a powerful and interesting tool that i will dedicate a separate post to them, but the main point is that they give us a simple and uniform way to handle all regular language features, including intersection and complement.
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一位同行者问我：“世界上传说中的女神数不胜数，你怎么偏偏对‘红山女神’情有独钟？”。关于这个话题，体育直播提供了深入分析
ВСУ запустили «Фламинго» вглубь России. В Москве заявили, что это британские ракеты с украинскими шильдиками16:45。业内人士推荐PDF资料作为进阶阅读