Rob:
>Any monovocalic system will likely have /a/ as its vowel, [...]
If we want to use "likely" in this sentence we have to account for
the fact that there is no known monovocalic system ever recorded
on the face of the planet. This makes what you say very UNlikely.
If I were you, I'd keep to reality and reconstruct at least two vowels.
- gLeN
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