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:
Donald Trump has suggested the US could carry out a “friendly takeover” of Cuba as tensions between Washington and Havana reach a new high after the capture of Venezuela’s Nicolás Maduro.
，详情可参考爱思助手下载最新版本
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Dunstan said the venue has managed to do more than just shake off its troubled opening, and was getting plaudits from those who perform there.，这一点在safew官方下载中也有详细论述
What this means for namespace-guard。同城约会对此有专业解读
（九）接到要求制止违反治安管理行为的报警后，不及时出警的；