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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但这些顾虑最终没有改变任何事情。。搜狗输入法2026对此有专业解读
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its own, with up to 20KB of user-available memory and diskette drive. A 3601