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    "name": "milli",
    "ml_name": "pr_si_milli",
    "symbol": "m",
    "numerator": 1.0,
    "denominator": 1000.0,
    "reference": "https://si-digital-framework.org/SI/prefixes/milli"
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    "exponents": "[3,0,0,0,0,0,0]",
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  "root_scale": "SC812",
  "unit": "UN1213",
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      "src_scale_id": "SC1171",
      "dst_scale_id": "SC1081",
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      "dst_scale_id": "SC1149",
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      "src_scale_id": "SC1171",
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  "is_special": null,
  "ref_point": "",
  "ref_point_l": null,
  "ref_point_h": null
}