Ubuhinzi-Umusozi
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Sisitemu yo guhiga-imirasire
Sisitemu yivanze-imirasire-yizuba "bivuga guhuza uburobyi n'izuba ryizuba. Izuba ryizuba rishyirwaho hejuru y'amazi yicyuzi cyamafi. Agace k'amazi munsi yizuba birashobora gukoreshwa mumafi no guhinga. Ubu ni ubwoko bushya bwigisekuru cyamashanyarazi.