Tadusi di tsengama d asemdu yedsemdayen ɣef tfekkiwin , Ayen id igellun s usemti (s ubeddil) n wadad n tfekka neɣ tanila-ynes neɣ ideg n trusi-ynes, Amdya Mara ad neckeṭ neɣ ad nemken tasegla (Takurt, ddabex) ad tezleg ɣef ukala-ynes. Tadusi d tasmekta yettwliwlen (ɣers azal d tnila) Ɣef wayen yellan deg [[alugen n Newton wis II) i tussna n tdusi tettwasxdem tagda ayi: Tadusi = Tasmekta × Tamsazla