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  "documentTitle": "US Mail Volumes to 2020",
  "authorId": "BCG",
  "authorName": "BCG",
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  "notes": "The chart uses a Marimekko (mosaic) plot to visualize volume distribution across multiple categorical dimensions.",
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      "text": "Note: segments do not sum to 177B pieces due to rounding. Source: BCG analysis",
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      "text": "Volume forecasts were created by segment",
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      "evidence": "p5 splits all mail into First-Class vs Standard subcategories; p6 forecasts each segment",
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      "structure": "The Whole -> Category A (distinct) -> Category B (distinct) -> Category C (distinct) -> Complete Coverage",
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