b-r-k bbook bo-bo bobko bobok bobr bokko bokok bokor booko boort booru borbo borko borku boro- borok boroo borot borou borro borut botok botou botro bottu bouko bouto brobo brook broto brouk brout brrrr btr-t bukk- bukor buroo burro burru burtt buruk burut butko buto- butor butot butou butuo butut k-rob k-t-b ko-ko kobru kobuk kokko kokor kokot kokou kokur kokut kooru korbo korku koror korro kortu koruk kotor kotto kottu kotur kouto kroot krout krtok kruto kubok kukko kukok kukur kurbu kurku kuruk kutob kuttu kutur o-r-b oboro obout obrok okbut okkur okobo okoro okrut okubo okuku okuru ooooo orbot orkut orobo orout ortok ortoo oruku oruro orutu otoku ototo otour otrok ottur oubut ouoro outro outto ro-ro robbo robo- robor robot robrt robur rokkk rokot rokto rorbu rotko roto- rotor rotot rotto roubt rouko routt rt-rk rubor ruutu tbtbt tbutt tobor tobot tobou tokko toko- tokor tokuo tokur torob torok torro torto tortu toto- totok totoo touro trbuk trott trout trubu truro ttttt tubo- tubou tukur tuotu turbo turbt turko turku turok turot turro turtu turut tutku tutor tutto tuuru ubobo ukobu urkut uroob urour urubu urutu utro- utror uttur uturu ututo uuork uuuuu