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. Contextual technical reasoning models assess both immediate errors and compensatory movement strategies.
2. The system can distinguish between a primary technical error such as inadequate hip hinge depth during landing and a secondary structural compensation such as excessive dynamic knee valgus collapse driven by weak abductor stabilization.
3. For example, during an improper squat landing, the model identifies the medial movement of the knee joint, explains the resulting ligament shear stresses and compensatory strain, and instructs the athlete to engage the hip abductors and track the knees over the feet during ground contact [36].
4. Multimodal sports ITS also plays a critical role in non-contact injury prevention, particularly in identifying and mitigating dynamic knee valgus (DKV) during jump landings and rapid cutting maneuvers [36].
5. Dynamic knee valgus combines hip internal rotation, knee abduction, and tibial external rotation, generating high mechanical shear loads across the anterior cruciate ligament (ACL) [36].
6. At the same time, peak knee flexion and hip flexion increased by 20%, shifting landing mechanics away from stiff, upright impacts toward softer, shock-absorbing postures that distribute forces through the posterior muscular chain [36].
</statements>

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