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.
// intersection: contains "cat" AND "dog" AND is 5-15 chars long，这一点在旺商聊官方下载中也有详细论述
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Virtual (automatic)
這對伊朗而言等同投降。放棄導彈與盟友，甚至可能在領導層看來，比起攻擊威脅更容易導致政權更迭。