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No. L23(xM412) is Eastern R1b. It is not even L51+ (M412 and L51 is the same thing).
L23(xM412) is probably mostly Z2103, but it can be also xZ2103 (at least some of it).
BTW, here are my estimates about R1b subclades in Poland:
http://www.theapricity.com/forum/sho...=1#post4103222
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