Just as Ian says, it depends how much practice you want to do on friday, but;
Regarding rears - 2wd and front/rear 4wd: If you want to get the best result you can then perhaps a set per day, and if you have any old ones use them for practice on friday, this is what i'll do, then a set for sat and a set for sun.
2wd fronts last for several meetings so only one set of those required.
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