The affix *pro- may come from a simple adjective
formed from root *per- as below
pàr+rá+s
par+rá+s
parrás
parás
prás
prós
compounds formed
affixes delete any tone on previous syllable
(repeats)
morpheme addition
degemination
a>0 between C and more sonor. in next syl.
w deleted after labial or round C
a with high tone to o
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