b-r-k bbook blook bloor blorb bluff blufr blurb blurr bo-bo bobko bobok bobr boffo 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 bruff brull buffo bukk- bukor bulb- bull- bulok bulou bulul burol buroo burro burru buruk floko flook floor floro floru flour fluff fluo- fluor flurb flurr follo forro forur fourb fouro fruko fu-fu fullf fullo furbo furo- furor k-rob kbool kloof ko-ko kobol kobru kobuk kobul kokko kokor kokou kokur kolbu kolff kollo kollu kolob kolol kolur koolu kooru korbo korff korku korol koror korro koruk koufu koulo kroll krull kubok kubul kukko kukok kukur kullo kullu kulob kulor kulul kulur kurbu kurku kurlu kuruk lobbo lobo- lobor lofou lokur lollo lolol loobu lookf loruk louro lubok lubur lukko lukok lukou lulul o-r-b obolo oboro obrok offof ofour okfol okkur okobo okoro okubo okuku okuru ollur olour ooooo orfor orful orlok orobo orolu oruku oruro oullo ouoro ourol ro-ro robbo robo- robor robur rofor rokkk rolfo rollo rolok rorbu rouko roulk roull rubof rubor ruffo rufo- rufol rullo ubobo ufofu uforb ukobu ullur ululu uluru uroob urour urubu uuork uuuuu