傅盛14天学习汇总（图源：公众号@傅盛)
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.
，更多细节参见体育直播
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Micah Zimmerman