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>
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</reference>

<statements>
1. Establishment-level evidence demonstrates that the integration of artificial intelligence alters employer recruitment strategies.
2. Acemoglu, Autor, Hazell, and Restrepo examined the universe of online job postings in the United States, discovering that firms actively adopting AI significantly reduced their hiring demand across traditional, non-AI vacancies.
3. While economy-wide aggregate employment shifts remained muted during the initial phases of AI diffusion, enterprise-level vacancy postings revealed an active restructuring: employers curtailed non-AI labor demand while reorienting remaining occupational profiles toward specialized quantitative and complementary analytical capabilities.
4. Empirical findings refute deterministic predictions of widespread technological unemployment.
</statements>

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