Tirohia te wāhanga i raro nei, kātahi ka whakautu i te pātai i muri mai i te reo kotahi me te wāhanga:  Passage: Ko te huringa reo tino motuhake e wehe ana i te Proto-Indo-Iranian mai i te Proto-Indo-European ko te hinganga o nga reo reo *e, *o, *a ki roto i te reo kotahi, Proto-Indo-Iranian *a (engari tirohia te ture a Brugmann). Ko te ture a Grassmann, te ture a Bartholomae, me te ture oro Ruki i oti i te Proto-Indo-Iranian.  Pātai: He aha te rerekētanga tino motuhake?
te whakakorenga o ngā pūoro whakahīhī *e, *o, *a ki tētahi pūoro kotahi