what do these abbrevs. mean for foreclosures?

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I an new to this and am hoping to learn a lot on this site...

I'm looking at a list of foreclosures in the Atlanta area and I see one of the following on all properties:

Stat: B
Stat: N
Stat: R

What do they mean? I read somewhere that Status B means that the foreclosure has been initiated (notice of default, perhaps?), but what about the others?

Thanks much!