Where the only relevant distinguishing factor between co-offenders is prior criminal history, that factor may justify a disparity in head sentences but does not necessarily justify a proportionally greater disparity in non-parole periods. A non-parole period representing almost 80% of the head sentence may offend parity where a co-offender's non-parole period represents 70% of their head sentence, if the distinguishing factor does not warrant the additional disparity.
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