bmp-r bo-bo bobr bobup bombo boomb booru borbo bormo boro- borom boroo borou borro borum borup brmmm brobo brom- bromo broom brrrr brumm bumbo bumbu bumpo buroo burro burru mboro mburu mmmmm mobor mobro mombo mombu mooro mopup morbo mormo morop moror morou morro morum morup mpbou mrmom mrorr mumbo mummu muppu murom muror murro murru murum murup o-r-b oboro obrom omoro omupo ooooo opobo oppum opump orbom ormur orobo oromo orrum oruro ouoro po-po pombo pomor pompu pomum poopo popop poppo popup poro- porro porum porur probo promo proor prop- propp propr pubo- puppo purmo puro- purum ro-ro robbo robo- robop robor robur rompo rompu roomu rorbu roumm rprop rubor rubup rumbo rummo rummu rumor rumpo ruomu u-pop ubobo umbro umour uroob urour urubu uuuuu