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>
At CES 2026, Roborock unveiled the Saros Rover, an AI-powered robot vacuum capable of climbing stairs, ramps, and slopes in multi-level homes

The robot uses wheel-leg technology, AI, sensors, and 3D mapping to plan | WION

At CES 2026, Roborock unveiled the Saros Rover, an AI-powered robot vacuum capable of climbing stairs, ramps, and slopes in multi-level homes

The robot...
</reference>

<statements>
1. While traditional robotic vacuums achieved commercial success, their utility remained limited by single-floor geometry and an inability to physically interact with everyday objects
</statements>

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