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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The number of people sleeping rough in England is at its highest level since records began in 2010.。关于这个话题，搜狗输入法2026提供了深入分析
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