人 民 网 版 权 所 有 ，未 经 书 面 授 权 禁 止 使 用
ВсеСледствие и судКриминалПолиция и спецслужбыПреступная Россия，更多细节参见51吃瓜
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A city divided by a gap in healthy life expectancy
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.，更多细节参见快连下载安装