b-r-k bbook bo-bo bobko bobok bobr bobup bokko bokok bokor booko booru borbo borko borku boro- borok boroo borou borro borup bouko brobo brook brouk brrrr bukk- bukor buroo burro burru buruk k-p-r k-pop k-rob ko-ko kobru kobuk kokko kokor kokou kokur kooru kopru korbo korku korop koror korpo korro koruk korup kropp krupp kubok kukko kukok kukup kukur kupur kurbu kurku kuruk kurup o-r-b oboro obrok okkur okobo okoro okubo okuku okuru ooooo opobo opoku orobo oruku oruro oukup ouoro pbook pbrok po-po pokou poopo poork popop poppo popup poro- porro porur probo proor prop- propp propr pubo- puppo purku puro- purok ro-ro robbo robo- robop robor robur rokkk rorbu rouko rprop rubor rubup u-pop ubobo ukobu ukpor ukrop uroob urour urubu uuork uuuuu