1. Niba uburebure bwa rivet ari burebure, umutwe wa rivet ni munini cyane, kandi inkoni ya rivet iroroshye kugorama;Niba uburebure bwa rivet ari bugufi cyane, uburebure bwa pir ntibuhagije, kandi gukora umutwe wa rivet ntabwo byuzuye, bigira ingaruka kumbaraga n'ubwoko bukomeye.2. Uburebure bwa rivet ni lo cyane ...
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