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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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圖像加註文字，劇迷馮緯丞身後掛著「獨立建國」旗幟新加坡國立大學政治系副教授莊嘉穎對BBC中文分析，「甄嬛熱」並未受到兩岸關係的影響，是因為該劇拍攝於2011年、習近平上台前，當時中國政府對於統戰台灣的積極度不如現在，「它（作品）是比較關於人性或社會多一些，和明顯的統戰會有一些距離」。