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. Standard unconstrained Structure-from-Motion (SfM) pipelines parameterize external camera poses independently for each captured frame, introducing up to 6M degrees of freedom
2. For rotation-symmetric, low-texture seeds (such as polished rice or smooth pulses), unconstrained estimation results in epipolar geometry failures and rotational drift
3. Camera projection centers C_i are restricted to a circular trajectory parameterized by rotation center C_0, stage normal n, and orbit radius ρ
4. A rotation flow field prior links primitive transformations across turntable increments: μ_i = R(θ_i, n)(μ_0 - C_0) + C_0
5. Constraining bundle adjustment optimization to circular orbits parameterized by a calibrated axis of rotation reduces camera extrinsic degrees of freedom, preventing projective drift and feature tracking failure on texture-poor seed varieties
</statements>

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