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.
这家1970年开放的医院，见证了Sun City医疗的完整进化，大致分为三个阶段：。safew官方下载是该领域的重要参考
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