-tree b-r-k bbbee bbook be-er be-ro bebek beber bebot beebe beeke beete beeut beker bekke bekko bekok beote beour berbe berek beret berk- berke berko berob beroe berok beror berre berru berte berto betee beter betke betoo betor betou betre bett- bette betto beuer beure beute bo-bo bobek bobet bobko bobok bobr bobre boeke boekt boero boeur bokeo boker boket bokko bokok bokor booer booke booko boore boort booru borbo boree borek borer boret borko borku boro- borok boroo borot borou borre borro borut botet botok botou botro botte bottu bouee bouer bouet bouke bouko boure boute bouto brebu breek breer breet breke breo- brere breto brett breu- brobo broek broer broke brook broto broue brouk brout brrrr bruer bruet bruke brute btr-t bubbe buber buker buket bukk- bukor burek buret burke buroo burro burru burte burtt buruk burut buteo buter butke butko buto- butor butot butou butte butuo butut ebber ebbet ebeko ebert ebook eboue ebure eeeee ekeko ekker ektor ekuku ekuru eorre erbbe erber erere erkko eroor erore eroto error errtu erte erter eruke eteke etete etoko etoro etour etree etrek etter eturu eubro euro- eurre k-rob k-t-b k-ute kebbe kebek keber kebob keere kerek keret kerre kertu ketek keter keto- ketou kette ketto ko-ko kobee kober kobru kobuk koeru koker koket kokko kokor kokot kokou kokre kokur kokut kooru korbe korbo korek korke korku koror korro korte kortu korue koruk kotor kotto kottu kotur kouer koure kouto kre-o kreek kreke kreo- krete kreuk kroke kroot krout krtok kruto kubek kuber kubok kukko kukok kukur kurbu kurek kurku kurre kurte kuruk kutob kutte kuttu kutur o-r-b obbet obert obete oboro obote oboue obout obreb obrok okbut okeke okere oketo okker okkur okobo okoro okrut okubo okuku okuru oo-er ooooo orbot oreo- orere orero orkut orobe orobo oroer oroke orout orret orter ortet ortok ortoo orube oruku oruro orutu otere otero otoku ototo otour otrok otter ottur otuke oture oubut ouert ouoro oure- outer outre outro outto rebbe reber rebet rebut reere rekke rere- reree reret rerob retee reter retro rette retto reuer reuet reute ro-ro robbe robbo rober robo- robor robot robrt robte robur roero rokee roker roket rokke rokkk rokot rokto rooer rooke roore roote rooue rorbu rorer rorke roteb roter rotko roto- rotor rotot rotte rotto roubt rouer rouet rouke rouko roure route routt rt-rk rubee ruber rubke rubor ruere ruete rukke ruter rutte ruutu tbtbt tbutt teber tebet tebuk teeko teket tekke tekko terek teret tereu terok teror terre terro tert- teruo teter tetr- tetro tette teuto to-be tobbe tober tobet tobor tobot tobou tobre toerr toeto toker tokke tokko toko- tokor tokuo tokur toobe tooke toore torbe toreo toret torke torob torok torre torro torte torto tortu torue toter toto- totoe totok totoo totte touke toure touro toute trbuk treer treet trere trete trett treut troee troke trott troue trout trubu truer truke truro trute tteok ttttt tubek tuber tubo- tubou tuero tukur tuotu turbe turbo turbt turek turet turko turku turok turot turre turro turtu turut tutee tuteo tutku tutor tutte tutto tuuru uber- ubobo ukeke ukert ukobu uouee ureo- urker urkut uroob urour urter urubu urutu utebo uter- utero utro- utror utter uttur utube uturu ututo uuork uuuuu