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:
// 边界处理：0辆车返回0，1辆车返回1（无需后续计算）
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"Only then will the artistes, their families, and their fans be free from further unnecessary noise," she said.