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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:，推荐阅读Line官方版本下载获取更多信息
2025 年第四季度携程录得其他收入 20.38 亿元，而去年同期为支出 1.37 亿元；
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