b-r-k bbook bo-bo bobko bobok bobr bokko bokok bokor bombo booko boomb booru borbo borko borku bormo boro- borok borom boroo borou borro borum bouko brmmm brobo brom- bromo brook broom brouk brrrr brumm bukk- bukom bukor bumbo bumbu buroo burro burru buruk k-rob ko-ko kobru kobuk kokko kokor kokou kokum kokur kombo kombu komku kooru korbo korku korom koror korro koruk kromo krumm kubok kukko kukok kukur kumbo kumru kumuk kurbu kurku kuruk mboro mburu mmmmm mobor mobro mokko mokro mokuk mokum mombo mombu mookk mooro morbo mormo moror morou morro morum mrmom mrorr mukur mumbo mummu mumok murko murom muror murro murru muruk murum o-r-b oboro obrok obrom okkur okobo okoro okubo okuku okuru omoro omuku ooooo orbom orkom ormur orobo oromo orrum oruku oruro ouoro ro-ro robbo robo- robor robur rokkk roomu rorbu rouko roumm rubor rumbo rummo rummu rumor ruomu ubobo ukobu umbro umour uroob urour urubu uuork uuuuu