{
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  "split_strategy": "deterministic sha256(file_id) % 10; bucket 0 is test, buckets 1-9 are train",
  "role_counts": {
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    "readme": 1,
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    "metadata_records": 1725,
    "sequence_shard": 1725
  },
  "columns": [
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    "download_pattern",
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  ]
}