Re: [tied] Timing of ablaut

> Lengthening by Brugmann's Law does not distinguish between /o/
>(1) in suffix syllables like ra:j-a:n-am, ra:j-a:n-as from *-on-m, *-on-es;
>(2) in the thematic vowel as bhar-a:-mas;
>(3) in the infix-based first part of causative-iteratives, as ma:n-áya-ti;
>(4) in the reduplication-triggered vocalism of the perfect, as ca-ká:r-a;
>(5) in a root with -o- as the short counterpart of a nom. -o:-, as pád-am.

This needs a longer answer than I have time for, but at least threee of
these precisely are the ablauting -o-:
(2) the thematic vowel
(3) the -o- vowel of causatives-iteratives
(4) the -o- vowel of perfects

Peter