bloor blorb blort bloto blott blout blurb blurr blurt bluto bo-bo bobr boll- bollo bollu bolto boluz boort booru borbo boro- boroo borot borou borro bortz borul borut borzu botou botro bottu boul- boulo boult bouto bozlu bozoo brobo broll brolo brool broto brout brrrr brull bruzz btr-t bulb- bull- bulou bulto bulul bulut buolt burol buroo buroz burro burru burtt burut buto- butor butot butou butuo butut buzzr bzzzt lobbo lobo- lobor lollo lolol loobu lorut lotor lotru lotto louro lubur lubz lulul lutol lutto luzzu o-r-b obolo oboro obout obzor ollur olotu olour ooooo orbot orobo orolu orout ortoo oruro orutu otolo ototo otour ottur otulu oubut oullo ouoro ourol outro outto ozoro ro-ro robbo robo- robor robot robrt robur rollo rollz rorbu roto- rotol rotor rotot rotto rotz rotzo roubt roull routt rubor rullo rutul ruutu tbolt tbtbt tbutt tllbr tobol tobor tobot tobou tolbo tollo toloo tolor tolu- toolt toolz torob torro torto tortu torul toto- totoo toull touro tozlu troll trooz 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 urroz urtlu urubu urutu urzut utro- utror uttur uturu ututo utzoo uuuuu z-out zollo zorbo zorlu zorro zotob zotto zrbtt zu-zu zzzzz