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:
30多年前，在福建最贫困的闽东山区任职，习近平同志就明确强调：
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2024年12月24日 星期二 新京报
for t := range c {