bbbbbb bobrun bonbon bondon bonnor bonnot bonnut bonobo bonton booboo booton borbon borbor bordon bordun bornon bornto bororo borton botoro botton boubou boudon boudou bounou bourou boutob bouton brodno bronno bront- bronto brotto brount brubru brudno bruron bruton brutto buborn bububu bundoo bunton burbot burbur burdon burdur burnou burnut burotu burton burutu butbro butron button buttto buutuo do-nut dobron dobrun dobrut dododo donbot dondon donnot donoor donour doorto dorbod dordon dornot dorobo dorond dorood dororo dorton dotbot dotdot dotodo doudou dounto dourou doutou doutro drobot drouot dubdub duddon dundun dundur dunoon dunord dunton durtro dutton n-toon nnundu nobbut noboru nodont non-no nonodd nonono nonoon noonoo noonor noonto norton notour notout notron notton nottoo noturn nounou ntuntu nunton nurton obtund obturb obudno odont- odonto odoorn ontour oooooo oordoo ordoru oroton orrour ortrud ottoor ourdon ouroun ourton outbud outour outrun outtro roboto roddon rondon ronnon ronron rooton roound rorodt rotour rotout rotrou rotton rotund roudno roundo roundu rounou routot rubbon rubbot rubout rubro- rubutu ruddon rudnun rudrur run-on runbot runout runton rurutu rutour tbontb to-on toboot toburn tonbon tonbur tondon tonono tonoro tonour tonton tootoo tornod torodo tororo tortor tortou totnor totoro totrot toubon toudon toudou touron tourou touton toutou toutuo trodon tronto trotro tround trudon truont tundun tuotuo turbo- turbot turnon turnor turnto turron turton turtur tururu tutour tutton tuttut u-boot u-turn ubundu ubuntu udburu unboot unborn unburn undurn unroot untorn untrod unturn urodon urturn utnoor utroor