You can compare half-vanyarian elves with
non-vanyarian elves and then subtract the
50 % non-vanyarin part.
For example: Feanor - 50 % noldor and Fingolfin - 50 % noldor. In this case it is
very simple because they have a common noldorian part, Finwe.
Another example is Idril, 62.5 % vanyarian vs. Caranthir - 38.5 % noldor.
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Ailios
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