The words 'care, supervision or authority' in s.48 of the Crimes Act 1958 (Vic) are to be given their ordinary disjunctive meaning and do not create a genus requiring identification of a common class. Where a standing teacher-pupil relationship exists, the relationship of care, supervision or authority subsists beyond school occasions and cannot be shed by the teacher merely because the sexual act occurs away from school premises or outside school hours. The relevant question is whether the relationship exists at the time of penetration, not whether the accused is actually exercising the position of advantage at that time.
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