Ruby's Greek Thread

[farmerjohn]

I think it is not a good idea about equivalence of oiin and aiin, p and f, t and k, and so on at least because it reduces the small Voynich alphabet even further. 
I have always thought of oiin as sort of contraction of oaiin (this naturally extends to oin, oiiin, don't forget about them). However some instances of oaiin are not contracted. Why? The situation can be analogous to using Latin letter V. As a vowel it may form diphthongs, but as a consonant not.