玩法二：从世界上的某一扇窗看城市天气
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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Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
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