The parity principle may justify a sentence that is prima facie unduly lenient by comparison to comparable cases where a co-offender of greater criminality received a dramatically lower sentence due to exceptional personal circumstances such as terminal illness and cooperation with authorities. There is no usual non-parole period, and a non-parole period of 56 per cent of the head sentence may be appropriate where the offender's age, antecedents and rehabilitation prospects indicate very limited need for community protection.
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