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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:。业内人士推荐旺商聊官方下载作为进阶阅读
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Home secretary will defy ‘plain wrong’ calls from unions and leftwing MPs that she is alienating Muslim voters，更多细节参见WPS下载最新地址
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