bo-bo bobr boort booru borbo boro- boroo borot borou borro borut botou botro bottu bouto brobo broto brout brrrr brujo btr-t bujor bujru buroo burro burru burtt burut buto- butor butot butou butuo butut jooto jotto jotur jouto ju-ju jubur juror jutro juuru o-r-b oboro obout ojuju ooooo orbot orobo orout ortoo orujo oruro orutu ototo otour ottur oubut ouoro outjo outro outto ro-ro robbo robo- robor robot robrt robur rorbu roto- rotor rotot rotto roubt routt rubor ruutu tbtbt tbutt tobor tobot tobou torob torro torto tortu toto- totoo touro trott trout trubu truro ttttt tubo- tubou tuotu turbo turbt turju turot turro turtu turut tutor tutto tuuru ubobo uroob urooj urour urubu urutu utro- utror uttur uturu ututo uuuuu