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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，这一点在heLLoword翻译官方下载中也有详细论述
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hence the name! Although, an effort was made to tweak the design to conform，详情可参考51吃瓜