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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.
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변요한·티파니 부부됐다…“오늘 혼인신고, 결혼식은 추후에”。关于这个话题，搜狗输入法下载提供了深入分析
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