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:
落成文档：在 Tbox 的「文档」模式里用 Ling 把 Review 结论整理成团队可读的评审纪要（问题分级、修改建议、可复制的重构片段、Checklist）。
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Today’s Wi-Fi extenders range from simple plug-in repeaters to more advanced models that behave like miniature access points or mesh nodes. Some are best suited for extending coverage to a single room, while others are designed to preserve faster speeds across larger spaces. Choosing the right one depends on your home’s layout, your internet plan and how much performance you’re willing to trade for convenience.