Seg tama n ubeddel d uɣelluy n teɣra nufa-d: abeddel n teɣra i → u Md: acbayli ac c a(y)c i 1 2 3 → acbaylu ac c a(y)c u, aɣelluy n teɣra Md: Lemrec (lm)c c →Lmarc (lm)ac c 1 2 3 1 2 1 2