b-r-k bbook blook bloor blorb blurb blurr bo-bo bobko bobok bobr bokko bokok bokor bolko boll- bollo bollu bolok boluk booko booru borbo borko borku boro- borok boroo borou borro borul bouko boul- boulo brobo broll brolo brook brool brouk brrrr brull bukk- bukor bulb- bull- bulok bulou bulul burol buroo burro burru buruk k-rob kbool ko-ko kobol kobru kobuk kobul kokko kokor kokou kokur kolbu kollo kollu kolob kolol kolur koolu kooru korbo korku korol koror korro koruk koulo kroll krull kubok kubul kukko kukok kukur kullo kullu kulob kulor kulul kulur kurbu kurku kurlu kuruk lobbo lobo- lobor lokur lollo lolol loobu loruk louro lubok lubur lukko lukok lukou lulul o-r-b obolo oboro obrok okkur okobo okoro okubo okuku okuru ollur olour ooooo orlok orobo orolu oruku oruro oullo ouoro ourol ro-ro robbo robo- robor robur rokkk rollo rolok rorbu rouko roulk roull rubor rullo ubobo ukobu ullur ululu uluru uroob urour urubu uuork uuuuu