When a sentencing judge fixes a non-parole period that is unusual in its relationship to the head sentence, stated reasons are generally expected; absence of reasons invites appellate scrutiny. A non-parole period cannot be fixed by a mechanistic or formulaic approach — discrete consideration of all relevant factors is required, including the penal element, deterrence, and rehabilitation prospects. Ill-health may be taken into account both in fixing the head sentence and again, with potentially additional weight, in fixing the non-parole period.
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