Seg wayi igga tazrawt i wammud n 100 n tenfusin tiɣerfanin n tmurt-nnes, yebdu isserwas tinfusin yemgaraden jar-asent ,ɣef uneggaru issegzel-d belli akked ma mgaradent tenfusin jar-asent rsint ɣet tict n tɣessa qqaren-as s Tefransist : les pripties de surface i d-yellan ɣef matta yettbeddalen deg tenfust (variable)= iwudam +matta ur nettbeddal ca =tigawin yettɛeddan seg tenfust ɣer tict .