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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。业内人士推荐51吃瓜作为进阶阅读
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增速的放缓，正是来自于民营酒店企业面临的多重压力。