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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your home folder (keeping the top-level modules/ directory intact). You could instead unpack
To be honest, that’s the only one I had even heard about. But apparently there have been a couple of other semi-successful ones…。关于这个话题，同城约会提供了深入分析