b-r-k bbook bo-bo bobko bobok bobr bobup bogor bogu bogur bokko bokok bokor booko booru borbo borgo borgu borko borku boro- borok boroo borou borro borup bouko bourg brobo brook brouk brrrr brugg bugok bugoo bukk- bukor burgk burgo burgu buroo burro burru buruk gboko go-go go-oo go-op gobbo gogok gogro goobo gopro gorgo grgur grogg grokk grook groop gropp group grrrr grubb gubbo gubru gukgo gurko guroo gurro gurur k-p-r k-pop k-rob ko-ko kobru kobuk kogro kokko kokor kokou kokur koogu kooru kopru korbo korgu korku korop koror korpo korro koruk korup kropp krupp kubok kugur kukko kukok kukup kukur kupur kurbu kurgo kurku kuruk kurup o-r-b oboro obrok ogogo ogugu okkur okobo okoro okrog okrug okubo okuku okuru ooooo opobo opoku orobo orrgo oruku oruro oukup ouoro pbook pbrok po-po pokou poopo poork popop poppo popup porgo poro- porog porro porur probo progg 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 ugro- ugrug ukobu ukpor ukrop ukuug uroob urour urubu uuork uuuuu