Iyo bigeze ku byuma, hari ubwoko butandukanye buboneka ku isoko, buri kimwe gifite imiterere yihariye kandi ikoresha. Ubwoko bubiri bukunze gukoreshwa ni ibyuma bya karubone hamwe nicyuma. Muri iyi nyandiko, tuzacukumbura itandukaniro riri hagati yubwoko bubiri bwibyuma, harimo ibisobanuro byabo, ibyiciro, ibiranga, nikoreshwa.