Re: [tied] PIE Stop System

>
> [AK]
> I think that Alb. <rreth> (pl. rrathë) 'circle, region' is from an
> lengthened o-grade form *ro:g^-, besides others derivates: <i
> drejtë> 'right' from d-reg^-to-, <mbroth> 'to prosper, to flourish'
> from an lengthened e-grade *mb-re:g^- and <rrjedh> from basic root
> *reg^-

Where does this 'nasal prefix(?)' (mb-re:g^ etc) in Albanian come
from (if that's what it is)?

Torsten