Why did Georgia attack South Ossetia in the first place?

I'm trying to figure out how it all started.
Update: That's right, I don't have a full view of the issue, that's why I'm asking here and trying to learn what's going on, but, you know, everybody says different things. I'm not Russian, Ossetian, or Georgian and I'm not "supporting" anyone, I just try to find out what happened.
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