Hardship to third parties caused by an offender's imprisonment, while only exceptionally justifying a reduction in the overall sentence, may be taken into account as a special circumstance affecting the ratio of non-parole period to the remainder of sentence. Where a sentencing judge makes a mathematical error that results in the sentence not reflecting the intended finding of special circumstances, the appellate court may intervene. An identical non-parole period imposed on a co-offender who played a lesser role in the offences may give rise to a justifiable sense of grievance under the parity principle.
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