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    {
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      "decision_session": "2025-03-14",
      "old_volume": 8927,
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      "switch_utc": "2025-03-16T22:00:00+00:00",
      "difference": 0.0
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    {
      "from_contract": "6BM25-CME",
      "to_contract": "6BU25-CME",
      "decision_session": "2025-06-13",
      "old_volume": 4654,
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      "switch_utc": "2025-06-15T22:00:00+00:00",
      "difference": 0.0008000000000001339
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    {
      "from_contract": "6BU25-CME",
      "to_contract": "6BZ25-CME",
      "decision_session": "2025-09-12",
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      "difference": 0.000300000000000189
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    {
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      "to_contract": "6BH26-CME",
      "decision_session": "2025-12-12",
      "old_volume": 5243,
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      "switch_utc": "2025-12-14T23:00:00+00:00",
      "difference": -0.00029999999999996696
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    {
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      "to_contract": "6BM26-CME",
      "decision_session": "2026-03-13",
      "old_volume": 9395,
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      "switch_utc": "2026-03-15T22:00:00+00:00",
      "difference": -0.00019999999999997797
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    {
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      "to_contract": "6BU26-CME",
      "decision_session": "2026-06-12",
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    {
      "from_contract": "6BU26-CME",
      "to_contract": "6BZ26-CME",
      "decision_session": "2026-09-11",
      "old_volume": 8248,
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      "switch_utc": "2026-09-13T22:00:00+00:00",
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}