（作者为中国社会科学院学部委员、台湾史研究中心主任）
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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people aged 70 to 79 who have not yet been vaccinated
В Финляндии предупредили об опасном шаге ЕС против России09:28