There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
Footage from local media showed people rushing to collect banknotes while police in riot gear tried to disperse them using teargas. Authorities were later seen setting the money alight in a bonfire at the scene of the crash.
，这一点在91视频中也有详细论述
Wallace was taking legal action against the BBC and BBC Studios after being sacked from the cooking show in July.
1997年4月，时任福建省委副书记的习近平同志赴宁夏西海固进行扶贫考察。“真正触动我对扶贫下那么大的决心，除了自己的经历，就是看了西海固。”
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人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用，更多细节参见夫子
Parents opposing plans told they can home school their children if they object to sending them to state schools