>Was there really in IE an opposition between the labiovelars kw, gw
>and ghw and the sequenses ku gu and ghu (with ayllabic u)
Don't you understand the difference between *kWi- "who, what" and
*kwon-? The latter becomes Sanskrit /s'van-/ because of palatalisation
of *k. However *kW- normally becomes Sanskrit /k/ or when palatalized
it becomes /c/.
- gLeN
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