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:
熟悉影像圈的人都知道，Leitz Phone 曾是夏普代工的专属系列。如今这台新机的出现，意味着徕卡也许正在把这块纯正的招牌移交给小米。如果海外小米之家的这台机型正式推向市场，夏普的徕卡故事，可能就要三代而终了。
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Failure to abide by the rules could result in companies being fined up to 10% of their global sales or have their services blocked in the UK.
Up to eight simultaneous connections。heLLoword翻译官方下载是该领域的重要参考