Are trace amounts of 0.1% reliable? There’s probably a reason why Ancestry doesn’t include groups that score under 1%
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BTW drb234 why do you think it is Ruthenian?
Based on surnames it is a very close call (5.5% vs. 5.0% according to Olszak-Przytycki, if his data is reliable).
However some ancestry from these groups could be absorbed by Poles even before surnames became common.