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. Applying intelligent tutoring paradigms to athletic training and physical education introduces distinct challenges because athletic mastery operates primarily within psychomotor, kinesthetic, and perceptual-motor domains
2. Motor tasks are characterized by high-degree-of-freedom musculoskeletal articulation, continuous temporal dynamics, non-verbal procedural knowledge, and subjective performance criteria
3. Extending this architectural framework into physical training requires shifting from discrete symbolic logic to continuous, biomechanically grounded multimodal analytics
4. Functional Operationalization in Athletic Environments for the Pedagogical Model: Implements motor learning theories, orchestrates drill difficulty, controls practice variability, and mitigates guidance dependency via faded feedback schedules
5. Functional Operationalization in Athletic Environments for the User-Interface Model: Delivers concurrent and terminal augmented feedback via spatial video overlays, movement sonification, and directional vibrotactile cues
6. Rather than delivering text hints, the pedagogical model manages perceptual-motor learning variables: contextual interference, practice scheduling, drill difficulty scaling, and feedback latency
7. The interface model serves as the physical bridge between computation and execution, deploying augmented reality overlays, acoustic parameter mapping, and wearable haptic actuators to guide human motor adjustments without imposing excessive cognitive load
8. Transforming diagnostic telemetry into motor learning requires intelligent instructional intervention [2].
9. Pedagogical models in sports ITS schedule practice tasks, regulate physical training load, and deliver augmented feedback based on the athlete's current developmental stage [2].
10. Augmented feedback must be managed carefully to avoid cognitive overload and overdependence [2].
11. Visual overlays project dynamic ghost avatars or skeletal motion paths over the learner's display, illustrating spatial discrepancies between their current posture and target biomechanics [2].
12. Physical encumbrance and sensor stability present another operational challenge [2].
</statements>

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