Ihahamuka rya syustem rishobora guterwa nimpamvu nkimpanuka zo mumuhanda, kugwa hejuru, kugongana nibintu bikomeye, kugwa gitunguranye, nibindi, bikangura amagufa yabantu kandi bikangiza kwangirika kwamagufwa ubwayo, bigatera indwara yamagufwa.
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