something with an observer pattern, and this codebase has no tools for that,
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a naive implementation of derivatives would need to compute a transition for every possible character (up to 65536 in UTF-16). minterms fix this by partitioning the character space into equivalence classes where all characters in a class behave identically.，这一点在PDF资料中也有详细论述
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В Израиле заявили о гибели организатора покушения на Трампа14:49，详情可参考快连下载安装