Introduction
Proto-Indo-European *h₂ew: "away from, since, again" cannot be formally tied to *h₂epó: "off, away", but the similarity is suggestive. Perhaps Pre-Proto-Indo-European *b became either *p (by fortition) or *w (by lenition) in almost all cases, accounting for the paucity of *b in PIE.
In any case, the later (re …
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