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You have to hit your peecee with your weenee first.

I have seen lazy labeling in the past where set 1 and 2 etc. are actually still revisions.

Unless it's possibly split archives he's seen and just isn't quite expressing it correctly :shrug:

Could you be more specific?

As there can be several reasons. Different regions like Pal/NTSC. Different scene release groups. Different updated/versions of games etc..