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Normal wear from not exactly track tires that were subjected to high temps.
For rotation i never cared much about same side or not, also usually rotating in X pattern, as not only wear front to rear may differ, also (if you visit same track) right to left may differ, due tracks usually being one direction, so turns to one side being more then to other. X pattern deals with evening wear just fine. Main thing to watchout for would be for rears being closer to each other by wear/size/tire model, as our cars have LSD diff instead of open one. Small variances may add much more load to it (as then it needs to work all the time, even when going straight), which results extra heat, degradation of diff oil, high wear (of expensive part). Hence manual mentions to never use spacesaver in rear (due LSD), but if puncture one, put front one in place, but spacesaver - in front. Or why one shouldn't replace just one tire in rear. Or why someone bitten by staggered tiresize bug looses ability to rotate tires to even out wear (in addition to adding lot of understeer to car).
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