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:
这些问题的答案，都越来越清晰。。雷电模拟器官方版本下载对此有专业解读
Что думаешь? Оцени!，这一点在safew官方下载中也有详细论述
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