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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即便是没有这个下沉空间，A10 后备厢的基础容积就已经达到了 602L，把二排座椅放倒后，还会来到 1549L。