Again there is confusion caused by lousy formatting issues; even the text posted by
Mwenenzi could be read either way.
Consider if the following change was made:
Within Australia only one non stop flight is permitted between Perth and Brisbane, Cairns, Melbourne or Sydney; and between Darwin and Melbourne or Sydney; and between Broome and Melbourne or Sydney.
If the wording was in this manner it would be specific and -MEL-PER-BME-SYD- would
not be permissible.
However, using similar techniques to "deduction by omission" the implications to me are that the routing
is permissible.
Of course it all gets down to whoever is booking your journey. YMMV