{
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    "market-id-1",
    "market-id-2"
  ],
  "filter": "orderbook"
}

{
  "type": "unsubscribe",
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  "markets": [
    "market-id-1",
    "market-id-2"
  ]
}

{
  "type": "subscribed",
  "channel": "user",
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  "events": null
}

{
  "type": "unsubscribed",
  "channel": "user",
  "status": "ok",
  "markets": null,
  "events": null
}

{
  "msg_type": "update-orderbook",
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    },
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    "chance": 40,
    "volume": 10000,
    "liquidity": 5000,
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  }
}

{
  "msg_type": "new-trade",
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    "taker_id": "user-789",
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    "qty_contracts": 10,
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    ]
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}

{
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    },
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    ]
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}