bdoor blood bloor blorb blurb blurr bo-bo bobr bodd- bodor boldo boldu boll- bollo bollu boold boord booru borbo bordo boro- borod boroo borou borro borul boudu boul- bould boulo bourd brobo brodd brodo broll brolo brood brool broud brrrr brud- brull buddu budur bulb- bull- bulou bulul buord burol buroo burro burru burud d-rod ddddd do-do do-ol dobro dodol dodoo dodro dollo dollu dolor doodo dorud doull douro drbob drobo droll drood drool droul dub-l dubbo dubul duddo dudou dullu lobbo lobo- lobor loddo lodro lollo lolol loobu loord lourd louro lubur luddu lulul o-r-b obodo obolo oboro obudu oddur odolo odoul odour odudu oduro ollur olord olour ooooo ordro orobo orodo orold orolu oruro oullo ouoro ourol rdllr ro-ro robbo robo- robor robur rodbo rodl rodor rollo roodu rorbu roull rubor rullo u-dub ubobo udol udoll ullur ululu uluru uroob urour urubu uuuuu