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:
Angered by the killings at the gates of parliament on 8 September, Nepalis of all ages took to the streets the following day. What had begun as protest rapidly hardened into mob violence, and police became immediate targets. Police stations were set ablaze, officers were assaulted, and three were killed.，详情可参考雷电模拟器官方版本下载
他们来到花都区田美村的杜氏宗祠，在浩瀚的族谱中，找到了杜耀豪父亲和爷爷的名字。（受访者供图）。快连下载安装对此有专业解读
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