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.
ВсеПрибалтикаУкраинаБелоруссияМолдавияЗакавказьеСредняя Азия，这一点在同城约会中也有详细论述
"inventoryId": "76561197976044629:f7cf0323-133f-49d6-872b-776f37ff7185",。Line官方版本下载是该领域的重要参考
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