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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Lucy Barrett, 17, saw Cruz supporting The Royston Club last year, but had no idea who he was until she got home.
Москвичей предупредили о резком похолодании09:45