Tasedmirt n twaksa d talmest n tsedmirin tigmanin dgi tettili twaksa n snat n tcubarin deg ucubar aẓaṛan deg yiwen n userrif neɣ sin n iserrifen, s wakka ad yelfu uraseṛwu n ucubar Tamahilt-a tettusemma Tawaksa tafnazayt, Tella telmest s wazal-is n tsedmirin n twaksa tla talkanin s talɣa tamatant yakk d tagrawt n tanaft yessedmiren d ilugan n Lewis i wakken ad tgi (ad ttexdem) alkin Tettwassen (tettusemma) tzukt n userrif amyiwen d umsin s tsedmirin E1 reaction d E2 reaction, s wesnay Tazukt E1 Aserrif amezwar: Aserrif wis sin : == Tazukt E2 ==