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:
在喧嚣尚未散去之际，他选择推出的，却是一张与胜利叙事不相干的唱片——舒伯特钢琴即兴曲。那不是一张赛后纪念专辑，也不是身份确认，而更像一次回撤：从比赛的中心退回音乐本身，从外部的评价回到内在的节奏。。关于这个话题，夫子提供了深入分析
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Большинство перевозчиков на рынке — это представители микробизнеса и малого бизнеса, а им не хватит средств на растущие издержки, особенно с учетом дополнительных факторов.