Note that on a *ONEWC* there is no rule restricting trans-cons in Australia
So if you fly into SYD from Asia, then your 4 SWP segments could be something like SYD-PER-SYD-BME-SYD - i.e two Aussie holidays
(note "The same city pairs/sectors cannot be flown more than once in the same direction" and this only works for SYD as you need to leave from there for JNB and to do it from anywhere else, such as MEL, would require a 5th SWP segment to get from MEL to SYD for the JNB flight)