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:
"The European Service Module is so important - we basically can't get to the Moon without it," says Sian Cleaver, a spacecraft engineer at Airbus.
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Республика Карелия — редкий случай, когда природная красота сочетается с простой логистикой и разнообразием маршрутов. Здесь путешествие можно устроить на лодке, на поезде или на автомобиле. Чаще всего туристы едут в горный парк «Рускеала», остров музей Кижи и на Ладожские шхеры.，详情可参考heLLoword翻译官方下载