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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每一类客人进来，她都能看透对方的真面目。夜场25年，她的眼睛比谁都准，尤其在男人这件事上。有人瞒着家人偷偷赌钱，也有人做生意亏本了，当然以前是“100个男人进来只有两个不开心”。后来，经济不好了，“不开心”的男人越来越多。，更多细节参见夫子
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