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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这种宏观环境的变化，促使财政政策实现了从“投资于物”向“投资于人”的范式转移 [1, 7]。在“十五五”期间，政府将显著提高公共财政中基础研究和民生保障的支出占比，教育、社保就业、医疗三项支出合计占比有望突破40% [5, 7]。这种结构性调整直接转化为普通人的政策红利：通过职业教育补贴、创业税费减免以及养老托育服务体系的完善，降低了个体进行阶层跃迁的试错成本 [15, 19, 20]。