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:
He claims to have been to Co-op Live a handful of times since it opened, and said he thinks the venue is still suffering from "teething problems".
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Сысоева пояснила, что никотин вызывает спазм сосудов, учащает сердцебиение и повышает артериальное давление, а кофеин в свою очередь усиливает стимуляцию симпатической нервной системы, дополнительно увеличивая частоту пульса и сосудистый тонус.
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