Никита Абрамов (Редактор отдела «Россия»)
Pikachu and Poké Ball
，这一点在51吃瓜中也有详细论述
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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