From: Miguel Carrasquer
>If *k comes from *ka, and *k' not only from older *ki, but also from *keWhat that shows is that *k^ should have been as frequent as *kW. It isn't:
>(and in parallel maybe besides *kw < *ku also *kw < *ko) it would be
>expected that *k would be less frequent than *k' (and *kw).