-Imyagen lan s usalaɣ (ur1a) deg wummid, mi ten-nessefti ɣer wurmir s “ad” ibeddel usalaɣ (ar1u) am akken yella di talɣa taḥerfit, taɣra yellan uqbel targalt tbeddel uɣru yuɣal d taɣra u→a, aked taɣra yellan sdat tergalt daɣen tbeddel aɣra tuɣal d uɣru a→u.