bo-bo boboc bobr bocom bocor bogor bogu bogur bombo booco boomb booru borbo borgo borgu bormo boro- borom boroo borou borro borum bourg brmmm brobo brom- bromo broom brrrr brugg brumm bucco bucum bucur bugoo bumbo bumbu burcu burgo burgu buroo burro burru buruc c-cor ccccc co-bo co-co cocc- cocco cocom cocum cocur combo comco commo commr comu- coomb coorg corbo corbu corm- cormo coro- corum couco coumb courb couru croco cromb cromo croom croum crumb cruor cubo- cubub cumbo cumbu cumm- cumo- cuoco cuomo curro curug go-go go-oo gobbo gocco gocoo gogro gombo gomor gomur goobo gorgo grgur grogg gromo groom grrrr grubb grumo gubbo gubru gumbo gumco gummb gummo guroo gurro gurum gurur mbogo mboro mburu mccoo mcmug mmccc mmmcc mmmmm mobor mobro mocco mombo mombu moogo mooro morbo mormo moroc moror morou morro morum mrcub mrmom mrorr muco- mucor mucro mucum mucur mugcr mugur mumbo mumcu mummu murgo murom muror murro murru murum o-r-b oboro obrom occur ocr-b ogogo ogugu omoro ooooo orbom ormoc ormur orobo oroco oromo orrgo orrum oruro ouoro r-co- ro-ro robbo robo- robor robur rocco rocor rocou roomu rorbu roumm rubor rumbo rummo rummu rumor ruomu ubobo ugro- ugrug umbro umour uroob urour urubu urucu uuuuu