Tabdut-agi tettili s tekci n wawal yesɛan yiwen n unamek s wawal-nni neɣ tafyirt ara yilin d timegdiwt-is neɣ s unemgal. ɣer Lehman(A) d MartinBerthet(F)(1997, sb: 320)nnan-d:yel amagrad n usegzawal n tutlayt yesɛa aḥric n tbadut s tmegdiwt neɣ s tenmeglawt s yimegla neɣ s yimeglawen iɣer yettuɣal umseknawal20..