Lee ebe a n'okpuru ma zaa ajụjụ ahụ n'otu asụsụ ahụ dị ka ebe ahụ: Ebe a: Mgbanwe kachasị dị iche iche nke na-ekewa Proto-Indo-Iranian site na Proto-Indo-European bụ ọdịda nke ụda olu * e, * o, * a n'ime otu ụda olu, Proto-Indo-Iranian * a (mana lee iwu Brugmann). Iwu Grassmann, iwu Bartholomae, na iwu ụda Ruki zuru oke na Proto-Indo-Iranian. Ajụjụ: Kedu ihe dị iche?
ọdịda nke ụda olu na-eme ka ụda olu * e, * o, * a ghọọ otu ụda olu