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:
如果将 iPhone 发布的 2007 年视为智能手机的元年，那么到今天，已经狂奔了近二十年。
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Perhaps that’s the biggest irony of all. Space is huge and mostly empty—and yet there’s no easy way to throw things out.
打破这夜的是警员突袭的查牌行动，几乎让所有人都乱了阵脚，小姐们像惊慌失措的羊群朝四面八方散去，侍应生以最快的速度清空舞池，所有的客人必须待在包厢里，不许在现场围观。
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Anthropic has consistently aimed to position itself as a more safety-orientated approach to AI research as compared to rivals.