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    "title": "Futures Roll Calendar & Front-Month API (CME)",
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        "properties": {
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              "active",
              "schedule",
              "holidays"
            ],
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            "description": "active: one row per symbol with the contract to trade now, the next contract and the expiring one. schedule: the next N contracts per symbol with all dates. holidays: the exchange holiday list for a year.",
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          },
          "symbols": {
            "title": "Futures root symbols",
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            "description": "Root symbols such as ES, MES, NQ, MNQ, RTY, YM, CL, NG, RB, HO, GC, MGC, SI, HG, ZN, ZB, ZF, TN, UB, 6E, M6E, 6B, 6J, 6A, 6S. Up to 50 per run. Unsupported symbols are returned as free error rows.",
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              "type": "string"
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          },
          "asOf": {
            "title": "As-of date",
            "type": "string",
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          },
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          },
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          "extraHolidays": {
            "title": "Extra closures",
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              },
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