“The bifurcation of Indo-Iranian is well known to be evident not only in South Asia, where all three of Indic, Nuristani and Iranian sub-branches are found, but also in ancient eastern Anatolia, where either an Indie language or undifferentiated Indo-Aryan or Indo-Iranian is evident in early Mitannian vocabulary (e.g. aika-wartanna ‘one course’, where aika is cognate to Sanskrit eka ‘one’, an Indie word) while Old Persian and Avestan are Iranian...”