Where the parity principle applies to one or more of a greater number of offences for which co-offenders are sentenced, the court may compare total effective sentences for all offences as an aspect of systematic fairness. Co-offenders need not be charged with identical offences for the parity principle to apply; the court looks to substance rather than form. An excessively lenient sentence on a co-offender does not require or permit the court to impose an excessively lenient sentence on the appellant, but the sentence may be reduced to a level still within the range of appropriate sentences.
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