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The 'magical' blue flower changing farmers' fortunes in India
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Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04
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:
音頻加註文字，中國調查解放軍最高級將領張又俠 學者：對「台灣問題」和現代化有深遠影響另一位高階將領劉振立上將也與張又俠一同被撤職。