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.
Раскрыты подробности похищения ребенка в Смоленске09:27
，这一点在夫子中也有详细论述
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