Deg 3000 n talɣiwin tumyigin n wammud, - 56% d isental n yizri, - 44% ttkan ɣer taggayt n wurmir, bḍan am wakka : a) Ad + Urmir = Azal n 30% b) Urmir ussid = Azal 10% c) Ad + Urmir Ussid = Azal 3% d) A / la = Azal 1%