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。91视频对此有专业解读
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:，这一点在下载安装 谷歌浏览器 开启极速安全的 上网之旅。中也有详细论述
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