{
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    "properties": {
        "content": {
            "type": "object",
            "properties": {
                "msgtype": {
                    "type": "string"
                },
                "body": {
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                "com.beeper.linkpreviews": {
                    "type": "array",
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        },
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            "properties": {
                "age": {
                    "type": "integer"
                }
            }
        },
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        },
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    ],
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}