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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（一）是本案当事人或者当事人的近亲属的；
（三）明知是赃物而窝藏、转移或者代为销售的；
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二是神舟二十三号飞行乘组中的1名航天员，将开展一年期驻留试验，而目前均为半年。