Seg tama n uɣelluy d ubeddel n umagrad nufa-d: aɣelluy n umagrad [a] Md: [aṭaǧin] ac ac ic → [ṭaǧin] Øc ac ic , abeddel n umagrad Md: a → i [amsarbaḥ] (ams)c1c2ac3 → 1 2 3 1 2 3 [imsarbaḥ] (ims)c1c2ac3.