bo-bo bobr boffo bonon bonou bonut boont boorn boort booru borbo born- borno bornt bornu boro- boron boroo borot borou borro borun borut boton botou botro bottu botun bourn bouto brobo broft bronn bront broon broto broun brout brrrr bruff brunn bruno brunt bruun btr-t btron bubon buffo bunun bunut buono burn- burnt buron buroo burro burru burtt burun burut butno buto- buton butor butot butou butuo butut forno forro forto forur foton fotur fount fourb fouro front froot frorn frunt fruto ftrtt fu-fu fuorn furbo furo- furor futon futur nnooo no-no nobob nobuo nobut nofor nofou nofun nofut non-u nonno nonot noonu noort norbu noron norro nortt norun notno noto- notof noton notto nourt nroff ntoro nu-nu nunon nunun nuoro nurun nuton o-bon o-r-b oboro obout offof offon offto offun ofono oforn ofoto ofour onoff onont onoon onorn onoto onour onout onto- ontof ontoo ontur ooooo orbot orfor ornon ornot orobo orono orout orton ortoo oruro orutu otono ototo otour ottur oubut ouoro ourno outof outon outro outto ro-ro robbo robo- robon robor robot robrt robun robur rofor ronno ronto rooft rorbu roto- roton rotor rotot rotto rotun roubt rount routt rubof rubon rubor ruffo rufo- runo- runof runon runto ruutu t-nut tbtbt tbutt tntnt tobon tobor tobot tobou toffo tofor tonbu tono- tonof tonto torob toron torro torto tortu torun toto- toton totoo tourn touro troff troft trono troon trott trout trubu truff truro ttttt tubo- tubof tubon tubou tunon tuotu turbo turbt turn- turno turnt turnu turon turot turro turtu turut tutor tutto tutun tuuru ubobo ufofu uforb ufton unfun unfur unnun unnur unnut unoft unoor unorn unrun unurn uroob urour urubu urutu utro- utror uttur uturn uturu ututo uuuuu