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Цены на нефть взлетели до максимума за полгода17:55。业内人士推荐雷电模拟器官方版本下载作为进阶阅读
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This formula is satisfiable because if we set to b to true and a to false, then the whole formula is true. All other assignments make the formula false, but it doesn't change that the formula is satisfiable as long as there is at least one assignment makes the formula true.