-tree bbbee be-er be-ro bebel beber beblo bebot beebe beeft beele beete beeut beffe befoe befol befor befur belbo belee belef belet bellb belle bello belot belue belur belut beofe beoff beote beour berbe berel beret berle berlo berob beroe berol beror berre berru berte berto betee betel beter betle betoo betor betou betre bett- bette betto betul beuer beule beure beute bleer bleet bleft blere blete bleue bloef bloor blorb blore blort blote bloto blott bloue blout bluer bluet bluff blufr bluft blurb blure blurr blurt bluto bo-bo bobet boble bobr bobre boeol boero boeuf boeur bofet boffo bolbe bolel boleo boler bolet boll- bolle bollo bollu bolte bolto booer boole boore boort booru borbo boree borel borer boret borle boro- boroo borot borou borre borro borul borut botel botet botou botro botte bottu bouee bouel bouer bouet boul- boule boulo boult boure boute bouto brebu breef breel breer breet brell brelo breo- brere breto brett breu- brobo broer broft brole broll brolo brool broto broue brout brrrr bruer bruet bruff brule brull brute btr-t bubbe buber buble buell bufet buffe buffo bufle bulb- bull- bulle bulou bulto bulul bulut buolt burel buret burle burol buroo burro burru burte burtt burut buteo buter butle buto- butor butot butou butte butuo butut ebber ebbet ebble ebell ebelo eberl ebert eblul eboue ebull ebure eeeee eeler ef-tu efere efetf effer effet efore eftel efter efuru efutu elbot eleet elele eleo- eleot eleut ellel eller ellet elloe ellul eloee eloff elole eloor elore eloro elote elout elrob eltro elubo elulu eluru elute eofor eorre erbbe erber erere eroor erore eroto errol error errtu erte ertel erter etete etoll etool etoro etour etree ettel etter ettle eturu eubro euell euler eurel euro- eurre febel feble febre feele feeor feere fefor felet felle felte feltt feoff feole ferel feret ferle ferlo ferr- ferre ferro ferte fetel feter feto- fetor fette feuer feule feute fleer fleet flere flero flert flete flett fleur floor flore floro floru flote floto flour flout fluff fluo- fluor flurb flure flurr flurt flute folet folle follo foole foore foote fore- forel foreo foret forro forte forto forur fotte fotur fouee fouel fouet foule fourb foure fouro freel freer freet frere frett freur frobe froot frore frote frute fruto ft-lb ftlee ftrtt fu-fu fuero fulbe fulle fullf fullo furbo furel furo- furor futur lebel leber lebet leell leeof leere leert lefeu leffe lefou leftb leful leleu lelle lerer lerot letbe letot letre lette letto letur leuro lobbe lobbo lober loble lobo- lobor lofer loffe lofou lofte loler lollo lolol loobu looer looft loore loote lorel loreo lorer loret lorre lorut lotof lotor lotru lotte lotto louer loule loure louro lubbe luber luble lubur luebo lufre lufte lulle lulte lulul lurer lurue lute- luteo luter lutol lutte lutto o-fer o-r-b obbet obele obert obete obole obolo oboro obote oboue obout obreb oelet oerel oerle offer offof offre offto ofoto ofour oftel ofter oleo- olere olleo oller ollur olotu olour oltet oltre oo-er ooooo orble orbot orell oreo- orere orero orfeo orfeu orfoe orfor orful orlet orobe orobo oroer orolu orout orret orter ortet ortoo orube oruro orutu otell otelo otere otero otole otolo ototo otour otter ottur otulu oture oubut ouert oullo ouoro oure- ourol outer outof outre outro outto rebbe rebel reber rebet rebol rebut reefe reeft reere refel refer refet reffe reffo refut relee relet rello relot relte relue rere- reree reret rerob retee retel reter retro rette retto reuel reuer reuet reule reute ro-ro robbe robbo rober roble robo- robor robot robrt robte robur roell roero rofel roffe rofor roleo rolfe rolfo rolle rollo rooer roofe rooft roole roore roote rooue rorbu rorer roteb rotel roter rotfl rotle roto- rotol rotor rotot rotte rotto roubt rouer rouet roufe roule roull roure route routt rubee rubel ruber ruble rubof rubor ruele ruell ruere ruete ruffe ruffo rufo- rufol ruler rullo ruter rutle rutte rutul ruule ruutu tbolt tbtbt tbutt teber tebet teele teell tefe tele- teleo teler teleu tell- telle tello telo- teolo teotl teret tereu teror terre terro tert- teruo tetel teter tetle tetr- tetro tette teuto tlell tlett tllbr to-be tobbe tobel tober tobet tobol tobor tobot tobou tobre toefl toeof toerr toeto tofet toffo tofol tofor tofte tolbo toler tolet tolle tollo toloo tolor tolu- toobe toole toolt toore torbe torel toreo toret torob torre torro torte torto tortu torue torul totel toter totle toto- totoe totoo totte touel toule toull toure touro toute treer treet trefe treff trele trere trete trett treut troee trofe troff troft troll trott troue troul trout trubu truel truer truff trule trull truro trute ttttt tuber tubo- tubof tubou tubul tuelf tuell tuelt tuero tuffe tufte tulet tulfo tulle tulor tulou tuotu turbe turbo turbt turel turet turle turot turre turro turtu turul turut tutee tutel tuteo tutle tutor tutte tutto tuuru ubble uber- ubobo ubolt uelfe ufere ufofu uforb ullet ullur ulteo ultre ululu uluru uouee urelu ureo- uroob urour urtel urter urtlu urubu urutu utebo uter- utero utole utro- utror utter uttur utube uturu ututo uuuuu