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[Pitchwife]

Originally Posted by Galin

While examples are scarce enough, and if ea is wanted anyway, a form in Namárie suggests that the genitive marker displaces final -a, as there we find Vardo for instance, rather than *Vardao.

I can't recall at the moment if other examples exist where -a is retained.

Methinks you're right - I was misled by Oiolossëo, where the final vowel is retained before the ending, but that's probably because e and o (unlike a and o) are dissimilar enough not to make the resulting cluster too uncouth. We also have in Namárië the form Calaciryo, genitive of Calacirya, so that looks like a rule - which leaves us with hína Eö.