Patrick:
> The great majority of languages have a front-
> central-back contrast at whatever heights for each
> member.
While this appears to be true, this doesn't logically
mean that front-back contrasting is a minimum
requirement for a vowel system. There is *no*
system that lacks height. There *are* vowel
systems that lack a front-back contrast. Plainly,
Patrick, your understanding of vowel systems is
akilter.
= gLeN
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