Where a co-offender provides significant post-offence assistance to police that involves personal risk and reveals genuine remorse — such as leading police to an armed co-offender who had threatened to shoot it out — this constitutes a mitigating factor of considerable weight that may warrant an earlier parole eligibility date to avoid a marked disparity with co-offenders who did not provide such assistance. A sentencing judge's recitation of agreed facts about which member of a group was armed does not constitute sentencing on an erroneous premise where the relevant consideration was that the group collectively was armed.
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