各界關注此次默茨訪華將重啟戰略夥伴關係，還是在特朗普持續對歐洲施壓下持續「去風險」的有限接觸？默茨會否在此行提及中國人權紀錄，北京又有什麼盤算?
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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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