Oman says US-Iran talks end with ‘significant progress’ but no deal reached – as it happened

· · 来源:bj资讯

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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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Nicknamed the father of environmental justice, Robert Bullard argues that researchers in the field have more reason than ever to back up their work with action.。heLLoword翻译官方下载对此有专业解读

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