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.
disappears when extract returns.，这一点在同城约会中也有详细论述
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在正定工作时，习近平同志在县委工作会议上就明确提出要求，“领导作风和工作作风要有一个突破性的变化”“一定要树立求实精神，抓实事，求实效，真刀真枪干一场”。
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“只要委员关注的选题准、研究深、意见实，就一定能得到重视、付诸实践、取得实效。”马建华说。