bloor blorb bluff blufr blurb blurr bo-bo bobr boffo boll- bollo bollu bolno bolon bonon bonou boorn booru borbo born- borno bornu boro- boron boroo borou borro borul borun boul- boulo bourn brobo broll brolo bronn brool broon broun brrrr bruff brull brunn bruno bruun bubon buffo bulb- bull- bulou bulul bulun bunun buono burn- burol buron buroo burro burru burun floor florn floro floru flour fluff fluo- fluon fluor flurb flurn flurr follo folon forno forro forur fourb fouro frorn fu-fu fullf fullo fuorn furbo furo- furor l-ron lobbo lobo- lobon lobor lofou lollo lolol loobu loron lorun louro lubno lubon lubun lubur lulul lurun nnooo no-no nobob nobol nobuo nofor nofou nofun non-u nonno noonu norbu noron norro norun nroff nu-nu nullo nunon nunun nuoro nurlu nurun o-bon o-r-b oblon obolo oboro offof offon offun ofono oforn ofour ollon ollur olour onoff onoon onorn onour ooooo orfor orful orlon ornon orobo orolu orono oruro oullo oulon oulun ouoro ourno ourol ro-ro robbo robo- robon robor robun robur rofor rolfo rollo rolon ronno rorbu roull rubof rubon rubor ruffo rufo- rufol rullo rulon runo- runof runon ubobo ufofu uforb ullur ulno- ululu uluru unfun unfur unnun unnur unoor unorn unrol unrun unurn uroob urour urubu uuuuu