Kubikorwa bya buri munsi byinganda, imashini nibikoresho bigira uruhare runini, gusa mugihe imashini nibikoresho bikora neza, kugirango bitange inyungu nziza mubukungu mubigo.Mu ruganda ruzunguruka, urusyo ruzunguruka rufite uruhare runini, ariko niba hari ibibazo bijyanye nibikoresho lubricat ...
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