Muke Tever wrote:
>
> I believe the intermediate in [tw] > [s] was some manner of [tSw], given
how it
> actually comes out as -ss- intervocalically (except in some dialects,
including
> Attic, which have -tt-).
>
> Examples are the second person pronoun, e.g. acc. *twe > se; and *twr=ks >
sarx "flesh".
>
> > I'm not sure about [kw] > [t] -- does Peter have a citation for that?
>
> Well, if the difference between [kw] and [k_w] is not being held, there
are:
>
> *penkwe > pente "five"
> *kwe > te "and" (encl.)
> *kwis > tis "who"
>
My IE>Greek is rusty, but wouldn't _tessera_ 'four' be an example for both
kw and tw? IIRC the changes affecting the labiovelars are all conditioned
by front vs. back vowels.