Vowel harmony part 2

Hey,

Thanks for your knowledgeable answers. :)  I've done a little research
myself, and I've found that a simple triangular system of i-a-u can become
a much fuller vowel system, with some sound changes.  Here is what I'm
talking about:

Original system:

i           u

      a

ai > e
au > o
ia > ä
iu > ü (high front rounded)
ua > u or o
ui > ï (high back unrounded)

New system:

i ü       ï u
e           o
ä           a

VH comes from fronting/backing of unstressed vowels based on
frontness/backness of stressed vowels.

What do y'all think?

- Rob

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