what if instead of just doing my nails red and black for the start of unlimited blade week I do kanshou and bakuya nails

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what if instead of just doing my nails red and black for the start of unlimited blade week I do kanshou and bakuya nails
people are worried about missing one regeneration or what the fuck moffat meant (but a lot of people have already said that in fact we only had 10 regenerations as we start counting 1to2, 2to3 and so on, so only 10, don't read anything else from that jfc!)
i'm just here worried about why the fuck it's supposed to be only 12 regenerations