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Through an interesting linguistic hypothesis, 'proto-Indo-European' (proto-/IE) received Afro-Asiatic (AA) influence via a branch labeled "Old Balkanic," which had similar features as Egyptian, Semitic, and Berber -- a new dead AA segment.
Instead of proposing Semitic direct contact, Bjřrn G. R. (2023) proposed an intermediate early Neolithic contact culture horizon that enriched IE regarding subsistence formations and numerical systems:
Insular Celtic had contact with AA speakers in the terminal Bronze Age. Or we're looking at an archaic sub-stratum that differentially influenced Celts (Matasović, 2012, p. 155):
One of the convenient interpretations is that the pre-Celtic language of the region before it got absorbed was either heavily AA imprinted or part of the AA genetic phylogeny.
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