Филолог заявил о массовой отмене обращения на «вы» с большой буквы09:36
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。关于这个话题，同城约会提供了深入分析
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Мощный удар Израиля по Ирану попал на видео09:41
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.