Some theonyms, proper names and other terminology of the Mitanni exhibit an Indo-Aryan superstrate, suggest that an Indo-Aryan elite imposed itself over the Hurrians in the course of the Indo-Aryan expansion. In a treaty between the Hittites and the Mitanni, the deities Mitra, Varuna, Indra, and the Ashvins (Nasatya) are invoked. Kikkuli's horse training text includes technical terms such as "aika" (cf. Sanskrit "eka", "one"), "tera" ("tri", "three"), "panza" ("pancha", "five"), "satta" ("sapta", seven), "na" ("nava", "nine"), "vartana" ("vartana", "turn", round in the horse race). The numeral "aika" "one" is of particular importance because it places the superstrate in the vicinity of Indo-Aryan proper as opposed to Indo-Iranian in general or early Iranian (which has "aiva")