 Matasović notes typological coincidences between Slavic and Ossetian, an Iranian language whose ancestor was Alanic.In both modern Ossetian and the Slavic group, verbs are conjugated for perfective and imperfective aspects; prefixation is a prominent means of deriving perfective verbs from imperfective verbs; there are certain syntactic behaviors of pronominal clitics in common; both sporadically mark direct objects with the genitive.It remains to be determined, however, whether those correspondences are a result of prehistoric contacts between Slavic and Alanic tribes, or just a case of accidental parallel development.