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>who also uses MMP (like Australia)

Australian federal lower house elections are single member IRV, upper house are multiple member STV. MMP isn't used anywhere in Australia.

I apologize, I was wrong. I'm not sure why I confused that. I appreciate the correction.

Correction, MMP is sort of used in Tasmania's lower house with the Hare-Clark thing.

And they've got an even more convoluted mechanism for their upper house :)