Reporting contributed by World Business Express
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:
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Цены на нефть взлетели до максимума за полгода17:55
移民議題曾是特朗普的政治強項，但他在明尼阿波利斯的執法行動導致聯邦探員槍殺兩名美國公民，嚴重削弱了特朗普的支持度。