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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（四）转让或者出租与纳税人机构所在地不在同一县（市、区、旗）内的不动产；。旺商聊官方下载对此有专业解读
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