You will be provided with a reference and some statements. Please determine whether each statement is 'supported', 'unsupported', or 'unknown' with respect to the reference. Please note:
First, assess whether the reference contains any valid content. If the reference contains no valid information, such as a 'page not found' message, then all statements should be considered 'unknown'.
If the reference is valid, for a given statement: if the facts or data it contains can be found entirely or partially within the reference, it is considered 'supported' (data accepts rounding); if all facts and data in the statement cannot be found in the reference, it is considered 'unsupported'.

You should return the result in a JSON list format, where each item in the list contains the statement's index and the judgment result, for example:
[
    {
        "idx": 1,
        "result": "supported"
    },
    {
        "idx": 2,
        "result": "unsupported"
    }
]

Below are the reference and statements:
<reference>
Client Challenge



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</reference>

<statements>
1. Zhao (2021), EURASIP Journal on Advances in Signal Processing (2021, art. 21), reported that "the support vector machine (SVM) can more quickly and effectively identify the actions…and the average recognition accuracy rate reaches 95.9%" (vs. 82.9% for a Gaussian mixture model).
</statements>

Begin the assessment now. Output only the JSON list, without any conversational text or explanations.