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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.
Hurdle Word 1 hintTo throw out.，更多细节参见91视频
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"risk_points": ["风险1", "风险2"],
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