The parity principle in sentencing must be applied throughout the entire sentencing process, including at the final stage when reviewing the product of all calculations and discounts, not merely at the outset when setting the starting point. For murder based on extended joint criminal enterprise, a getaway driver not present at the scene who did not physically invade any premises or threaten any person, but who had knowledge of the potential for serious violence, warrants a significantly lower starting point than co-offenders who entered the premises and participated in or witnessed the attack. Youth and lack of antecedents are not of themselves special circumstances under s 44.
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