Kugeza ubu ibyuma bikoreshwa mu nganda zinyuranye muburyo butandukanye, nkibisate byubatswe byubatswe ibyuma, ibifuniko byo mu mwobo, sisitemu yo kuvoma amazi, ingazi zicyuma, ibisenge byubaka, nibindi. Bitewe nibyifuzo bitandukanye byingeri zose, gusya ibyuma bifite ...
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