bloor blorb blurb blurr bo-bo bobr 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 brull brunn bruno bruun bubon bulb- bull- bulou bulul bulun bunun buono burn- burol buron buroo burro burru burun l-ron lobbo lobo- lobon lobor lollo lolol loobu loron lorun louro lubno lubon lubun lubur lulul lurun nnooo no-no nobob nobol nobuo non-u nonno noonu norbu noron norro norun nu-nu nullo nunon nunun nuoro nurlu nurun o-bon o-r-b oblon obolo oboro ollon ollur olour onoon onorn onour ooooo orlon ornon orobo orolu orono oruro oullo oulon oulun ouoro ourno ourol ro-ro robbo robo- robon robor robun robur rollo rolon ronno rorbu roull rubon rubor rullo rulon runo- runon ubobo ullur ulno- ululu uluru unnun unnur unoor unorn unrol unrun unurn uroob urour urubu uuuuu