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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:
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细观蜡梅，花瓣层叠，错位交叉，以花蕊为核心，紧紧簇拥在一起。花瓣厚实，直至凋谢都不会褪色；常于枯枝绽放，不借绿叶衬托，枯萎后也常留枝头。这种坚韧的品性，恰如宜昌这座城市，愈是危难困境，愈是凌霜傲雪，勇毅绽放。，推荐阅读同城约会获取更多信息
Less than 10% of users are expected to need to verify their age when the company does roll out the process later this year, he added.。关于这个话题，51吃瓜提供了深入分析