a) the one proposed above - in this case we must consider *r- in PA and PTs as a former class prefix (which raises some doubts);
b) we can reconstruct *Gēlu (with *l) and a metathesized variant *lēGV > PA *riʁi-, PC *rɨχi- (with a rather frequent *-lV extension).
At present it is hard to choose one of these solutions only.
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