rebo rebu reeb reek reet reev reke reko rekt reot reou rere rero rert reru rete reto retr rett reue reuk reut reuu reve revo rob- robb robe robo robt robu roer roet roev roke rokk roko rokr roku roob rook roor root rore rork roro rort roru rote rotk roto rotr rott roub roue rouk rout rove rovo rrrr rtee rtve rubb rube rubu ruer ruet ruke rukk ruku ruok rure ruro ruru rute ruto rutt rutu ruve ruvu rver tbrb tebo tebu teek teer teet teev teke teok teor ter- tere terk tero terr teru tete teto tetr tett tetu teuk teut tobe tobo tobt tobu toee toek toer toet toke toko toku took toor toot tore tork toro torr tort toru torv tote toto totr tott touk tour tout touv tove tovo tre- tree trek treo tret treu trev troe troo trot trou trte trtr trub true truk trut truu ttbb tteo tter ttoe tttt tubb tube tubo tubr tubu tuer tuet tuke tuko tuor turb ture turk turo turr turt turu tute tuto tutt tutu tuuo tver tvro tvrr tvtv ubbe ubbo ubek uber ubet ukek ukeu ukko ukok uktv ukur uoke uor- uore uovo urbe ure- uret urke uro- urok uroo urre urte uruk urur urut urve uter utor utto uttu uuuu uv-b uver uvok uvvu veer veet veke veor ver- verb vere verk vero vert vete veto vetr veur veve vevo vkor voer voet voeu voke voor voot vor- vore voro vort voru vote voto voue vouk vour vout vovk vreo vret vrot vrto vruk vuku vurb vurt vutv vver vvob vvvv

-tree b-r-k bbbee bbook be-er be-ro bebek beber bebot beebe beeke beete beeut beeve 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 beuve bever bevke bevor bevue bo-bo bobek bobet bobko bobok bobov bobr bobre boeke boekt boero boeur bokeo boker boket bokko bokok bokor bokov booer booke booko boore boort booru borbo boree borek borer boret borko borku boro- borok boroo borot borou borov borre borro borut borve borvo botet botev botok botou botro botte bottu bouee bouer bouet bouke bouko boure boute bouto bovee brebu breek breer breet breke breo- brere breto brett breu- breve brobo broek broer broke brook broto broue brouk brout brrrr bruer bruet bruke brute btr-t bubbe buber buker buket bukk- bukor bukov burek buret burke buroo burov burro burru burte burtt buruk burut buteo buter butke butko buto- butor butot butou butov butte butuo butut ebber ebbet ebeko ebert ebook eboue ebure eeeee eevee eever ekeko ekker ektor ektov ekuku ekuru eorre erbbe erber erere ereve erkko eroor erore eroto error errtu erte erter eruke eteke etete etoko etoro etour etree etrek etter eturu eubro euro- eurre evere evero everr evert evete evett eveve evoke evoor evote evour evtek k-rob k-t-b k-ute kebbe kebek keber kebob keere keeve kerek keret kerre kertu kerve ketek keter keto- ketou kette ketto kever 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 kortv korue koruk korve kotev kotor kotov kotto kottu kotur kouer koure kouto kovor kovur kre-o kreek kreke kreo- krete kreuk kroke kroot krout krtok krtov kruto kubek kuber kubok kukko kukok kukur kurbu kurek kurku kurov kurre kurte kuruk kutob kutte kuttu kutur o-r-b obbet obert obete oboro obote oboue obout obreb obrok obrov okbut okeke okere oketo okker okkur okobo okoro okrut okubo okuku okuru oo-er ooooo oovoo orbot oreo- orere orero orkut orobe orobo oroer oroke orout orret orter ortet ortok ortoo orube oruku oruro orutu orvet otere otero otoku ototo otour otrok otrov otter ottov ottur otuke oture oubut ouert ouoro oure- outer outre outro outto outtv ouver ouvre over- overo overt ovett rebbe reber rebet rebut reere reeve rekke rere- reree reret rerob retee reter retro rette retto reuer reuet reute rever revet revue ro-ro robbe robbo rober robo- robor robot robrt robte robur roero rokee roker roket rokke rokkk rokot rokto rooer rooke roore roote rooue roove rorbu rorer rorke roteb roter rotko roto- rotor rotot rotte rotto roubt rouer rouet rouke rouko roure route routt rover rt-rk rtrev rttov rubee ruber rubke rubor ruere ruete rukke ruter rutte ruutu tbtbt tbutt teber tebet tebuk teeko teket tekke tekko tekov terek teret tereu terok teror terre terro tert- teruo terve tervo teter tetov tetr- tetro tette teuto teuvo tevet tevot tkkev 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 torve toter toto- totoe totok totoo totte touke toure touro toute tover tovet trbuk treer treet trere trete trett treut treve troee troke trott troue trout trove trovo trubu truer truke truro trute trutv truvo tteok ttttt tubek tuber tubo- tubou tuero tukur tuotu turbe turbo turbt turek turet turko turku turok turot turov turre turro turtu turut turve turvo tutee tuteo tutku tutor tutte tutto tuuru tuvok tvoku 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 uvrou v-bob v-bor veber vebre veere veeve vekke vekre verbo vereb verek verke verot verre verte vertu verve vette vetto vetuk veuve veveo vever voere vokee vokov voobu voore vooru vorbe vorke vorre vorte voter votre votto voure voute vrbov vuere vurot vutov vuver

b-tree bbbbbb bebeto bebook bebout bebove beebee beeker beeter beever beevor bekker bekoor bekoro bekovo berbee berbeo berber bereet bereke bereko berere berevo berker berkov berkut berour berovo berrer berret bertre berube betere betete betook betrue bettee better bettor betutu beurre bevoor bobber bobeke bobete bobkov bobote bobovo bobrek bobrok bobrov boeber boerre bokere bokett bokoro boober booboo booker bootee booter booue borbor boreto borkou boroko borore