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:
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Some 55,000 men are diagnosed with the disease each year, and 12,000 men die from it in annually in the UK.。heLLoword翻译官方下载是该领域的重要参考
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Ранее самолет иностранной авиакомпании совершил аварийную посадку в аэропорту Красноярска. На борту Uzbekistan Airways с 122 пассажирами обнаружили техническую неисправность.