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:
Scientists say the findings are a warning about the kinds of chemical that people are exposed to in the environment.
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（三）多次殴打、伤害他人或者一次殴打、伤害多人的。
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过去三个月，a16z发了三份报告。