R and r

[petegray]

Ed suggested a contrast in Classical Greek (rho / rho with spiritus asper or
dasemon)?

I cannot think of any words where there would such a contrast.  In the
absence of such words, the presence or absence of the spiritus asper is
purely mechanical, and therefore not phonemic, so there cannot be a phonemic
contrast.   Some modern publications no longer even print the spiritus
asper, since it is so predictable.

Peter