Miguel:
> My hitherto preferred explanation *-o-mW-i >
> *-o-mW-u > *-owu > *-รต would I'm afraid produce a
> circumflex,
Circumflex accent is naturally produced after the
disintegration of IE however the change of *-omi to
*-o: would have occured right after Vowel Shift,
*before* IE had started to fragment, thereby
making it incapable of producing circumflex accent.
= gLeN
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