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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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（六）作出处罚决定的公安机关的名称和作出决定的日期。
那些“中式梦核”的视频里，画面都是空的——教室、走廊、房间都空无一人。但真正的千禧年并非如此。那是一个热闹、温情的时代，每一个角落都盛满了声音与人情。
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