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:
在发言中，习近平同志表示“正确的政绩观指导我们正确地改造主观世界”，并条分缕析阐释树立正确政绩观必须着重解决的问题。那一年，他在《浙江日报》“之江新语”专栏陆续发表文章，阐明政绩观的是非标准与实践路径。
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Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08