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      "xlabel": "Constructed contaminated fraction",
      "ylabel": "Accuracy in hypothetical mixture",
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  "title": "Mixture scores can rise without clean-subset improvement",
  "assumptions": "Constructed clean accuracy0.5 and contaminated accuracy0.99; no inference about any real model or benchmark.",
  "worked": "假设污染部分准确率0.99、其余0.50，污染占20%时总分0.598，而未污染能力仍0.50。这只是加权恒等关系，不能反推出真实污染率。",
  "source_ids": [
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    "原文 / 规范化哈希",
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    "精确及近似匹配",
    "人工抽查与分层评估",
    "版本化删除和复核记录"
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