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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，这一点在服务器推荐中也有详细论述
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When a crash happens, we don’t just get an error message. We get a crash log containing the initial input and the execution trace complete with all outputs.
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