bholu bhool bhour bloor blorb blurb blurr bo-bo bo-ho bobr bohol bohor bolho boll- bollo bollu booru borbo boro- boroo borou borro borul boul- boulo brloh brobo brohl broll brolo brool brrrr bruhl brull bulb- bull- bulou bulul buoho burol buroo burro burru hhhhh hhour ho-ho ho-oh hobol hobor hobro hobub hohol holbr hollo holo- holor holou holub holul horol horro horru hubur huhuh hullo huolu hurll huuru lobbo lobo- lobor lohho lohur lollo lolol loobu louro lubur lulul o-r-b obhor obolo oboro oh-oh ohour ohrob ollur olour ooooh ooooo orobo orolu oruro oullo ouoro ourol ro-ro robbo robo- robor robur rohob rohru rollo rorbu roull rubor ruhub rullo ubobo uh-oh uh-uh uhhoh uhhuh uhuru ullur ululu uluru uroob urour urubu uuuuu