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.
Investigation under way after vehicle ploughs into building
，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。
Space & Astronomy
BAS takes on up to 150 new recruits for Antarctica each year. While specialist science and engineering roles form the backbone, around 70% of the jobs are the operational roles required to keep the stations functioning.
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