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:
上世纪90年代，表演队第一次走出东坝，在南京市区参加春节金陵民间文化庙会，一炮而红，又在沈阳、北京、广州、上海等城市参加表演。说起去年10月，大马灯登上“苏超”南京奥体中心的比赛中场，汤春山打开话匣子：“大场面见多哩，就是得走出去！”
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“A Supreme Court otherwise inclined to endlessly expand Trump’s authority just restricted his go-to tool, ruling that U.S. presidents do not have the power to unilaterally deploy tariffs and dole out punishment and favor to specific companies and economic sectors, friends and family, and entire countries,” said Lori Wallach of Rethink Trade.。业内人士推荐搜狗输入法下载作为进阶阅读
Медведев вышел в финал турнира в Дубае17:59
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