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  "anchor_contract": "CLZ26-NYMEX",
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    {
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      "decision_session": "2025-05-16",
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      "switch_utc": "2025-05-18T22:00:00+00:00",
      "difference": -0.5500000000000043
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    {
      "from_contract": "CLN25-NYMEX",
      "to_contract": "CLQ25-NYMEX",
      "decision_session": "2025-06-17",
      "old_volume": 53777,
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      "switch_utc": "2025-06-17T22:00:00+00:00",
      "difference": -1.7099999999999937
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    {
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      "to_contract": "CLU25-NYMEX",
      "decision_session": "2025-07-18",
      "old_volume": 27415,
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      "switch_utc": "2025-07-20T22:00:00+00:00",
      "difference": -1.2800000000000011
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    {
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      "to_contract": "CLV25-NYMEX",
      "decision_session": "2025-08-18",
      "old_volume": 19733,
      "new_volume": 136874,
      "switch_utc": "2025-08-18T22:00:00+00:00",
      "difference": -0.740000000000002
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    {
      "from_contract": "CLV25-NYMEX",
      "to_contract": "CLX25-NYMEX",
      "decision_session": "2025-09-18",
      "old_volume": 23413,
      "new_volume": 136886,
      "switch_utc": "2025-09-18T22:00:00+00:00",
      "difference": -0.3200000000000003
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    {
      "from_contract": "CLX25-NYMEX",
      "to_contract": "CLZ25-NYMEX",
      "decision_session": "2025-10-16",
      "old_volume": 110211,
      "new_volume": 125880,
      "switch_utc": "2025-10-16T22:00:00+00:00",
      "difference": -0.46999999999999886
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    {
      "from_contract": "CLZ25-NYMEX",
      "to_contract": "CLF26-NYMEX",
      "decision_session": "2025-11-18",
      "old_volume": 33912,
      "new_volume": 165514,
      "switch_utc": "2025-11-18T23:00:00+00:00",
      "difference": -0.10000000000000142
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    {
      "from_contract": "CLF26-NYMEX",
      "to_contract": "CLG26-NYMEX",
      "decision_session": "2025-12-16",
      "old_volume": 111980,
      "new_volume": 112740,
      "switch_utc": "2025-12-16T23:00:00+00:00",
      "difference": -0.10000000000000142
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    {
      "from_contract": "CLG26-NYMEX",
      "to_contract": "CLH26-NYMEX",
      "decision_session": "2026-01-15",
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      "new_volume": 218707,
      "switch_utc": "2026-01-15T23:00:00+00:00",
      "difference": -0.13000000000000256
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    {
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      "decision_session": "2026-02-17",
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      "new_volume": 136929,
      "switch_utc": "2026-02-17T23:00:00+00:00",
      "difference": -0.0799999999999983
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    {
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      "decision_session": "2026-03-17",
      "old_volume": 188080,
      "new_volume": 229228,
      "switch_utc": "2026-03-17T22:00:00+00:00",
      "difference": -0.7400000000000091
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    {
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      "decision_session": "2026-04-16",
      "old_volume": 104918,
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      "switch_utc": "2026-04-16T22:00:00+00:00",
      "difference": -3.530000000000001
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    {
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      "decision_session": "2026-05-15",
      "old_volume": 34568,
      "new_volume": 120849,
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      "difference": -4.47999999999999
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    {
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      "difference": -0.6300000000000097
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    {
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      "decision_session": "2026-07-17",
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      "switch_utc": "2026-07-19T22:00:00+00:00",
      "difference": -0.7000000000000028
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    {
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      "decision_session": "2026-08-18",
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      "difference": -0.8799999999999955
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    {
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      "decision_session": "2026-09-18",
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      "difference": -4.049999999999997
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    {
      "from_contract": "CLX26-NYMEX",
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      "decision_session": "2026-10-16",
      "old_volume": 41247,
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      "difference": -2.7900000000000063
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  ]
}