Mubihe bigezweho, icyifuzo cyibikoresho birambye kandi bitandukanye byatangiye, cyane cyane mubwubatsi no gukora inganda. Muri ibyo bikoresho, ibice by'imiti yizuba byagaragaye nk'ikigereranyo cy'ingenzi, kigira ingaruka ku mirenge itandukanye. Iyi ngingo ishakisha inzira eshanu zitangaje
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