The subclades of the network some of which are associated with the practice of pastoralism are most likely to have taken place in the Sahara, among an early population that spoke ancestral language common to both Nilo-Saharan and Afro-Asiatic speakers, although it is yet to be determined ...
I am referring to the inner nodes which stand between the root, under whose dominance the related languages are gathered, and the attested language leaves - those intervening nodes, those linguistic taxa, which, by the logic of the enterprise, should represent intervening, and for the most part...