From: Miguel Carrasquer
>> Does *k^at- have a problem? I thought we could write PIE with only e/o/e:/o:/& vowels,Another source of *a are *e's after a velar (uvular) *k, *g, *gh, but judging by
>> but how do we render *k^at? ...
>I'm not a laryngeal purist. "Non-larygeal" *a doesn't take part in any ablaut alternations,
>but I see no reason why it shouldn't have existed as a phoneme (it certainly existed as a
>very distinct allophone of *e). There are words like *k^aso- 'hare; grey' which seem to require
>*a, and I somehow don't feel that reconstructions like *dah2iwer- of *g^Hah2ns- are all that
>superior to *daiwer- and *g^Hans-. Miguel thinks some instances of *a reflect an old nasalised
>vowel. Whether he's right or wrong, there may have been more sources of *a than are dreamt
>of in Beekes.