bloor blorb blort bloto blott blout blurb blurr blurt bluto bo-bo bobr boll- bollo bollu bolto boort booru borbo boro- boroo borot borou borro borul borut botou botro bottu boul- boulo boult bouto brobo broll brolo brool broto brout brrrr brull btr-t bulb- bull- bulou bulto bulul bulut buolt burol buroo burro burru burtt burut buto- butor butot butou butuo butut lobbo lobo- lobor lollo lolol loobu lorut lotor lotru lotto louro lubur lulul lutol lutto o-r-b obolo oboro obout ollur olotu olour ooooo orbot orobo orolu orout ortoo oruro orutu otolo ototo otour ottur otulu oubut oullo ouoro ourol outro outto ro-ro robbo robo- robor robot robrt robur rollo rorbu roto- rotol rotor rotot rotto roubt roull routt rubor rullo rutul ruutu tbolt tbtbt tbutt tllbr tobol tobor tobot tobou tolbo tollo toloo tolor tolu- toolt torob torro torto tortu torul toto- totoo toull touro troll trott troul trout trubu trull truro ttttt tubo- tubou tubul tulor tulou tuotu turbo turbt turot turro turtu turul turut tutor tutto tuuru ubobo ubolt ullur ululu uluru uroob urour urtlu urubu urutu utro- utror uttur uturu ututo uuuuu