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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.，更多细节参见搜狗输入法下载
dataclasses-style method generation。51吃瓜对此有专业解读
The employment slowdown has raised concern about the health of the economy, but evidence of wider deterioration is elusive.