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Медведев вышел в финал турнира в Дубае17:59。关于这个话题，旺商聊官方下载提供了深入分析
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Полина Кислицына (Редактор)。业内人士推荐搜狗输入法下载作为进阶阅读
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.