>
> Where does the Prakrit (incl. Pali) word _cha_ 'six' come from?
> I don't see how to relate it to Sankrit SaS- beyond a vague
> similarity.
Isn't it supposed to come from a variant beginning with
*k or *kW, as seen in Avestan xva or Ossetic æxsæz?
Although I don't remember if Old Indo-Aryan kS- resulted
in Prakrit ch- or not. Do you know?