Tazrawt-a i nexdem tessaweḍ-aɣ ɣer kra n yigmaḍ : - Di tazwara nufa-d dakken tazrawt i nexdem tessaweḍ-aɣ ad nini belli yella wassaɣ ger usalaɣ n umyag d usalaɣ n yisem n tigawt. Md : QLB = qelleb (c C c ) = 1 2 3 aqelleb (ac C c ).