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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:，更多细节参见safew官方版本下载
重启一遍 Termux 后，再执行以下操作：，这一点在Line官方版本下载中也有详细论述
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