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.
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08。关于这个话题，WPS下载最新地址提供了深入分析
S&P 500 Index futures are down 0.5% as of 7:39 a.m. in New York, set to notch a monthly loss.，更多细节参见51吃瓜
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