Lowest danger rate
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。关于这个话题，雷电模拟器官方版本下载提供了深入分析
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.
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Fraser Smeaton, cofounder of MorphCostumes.