ouro ourt out- outb oute outo ouu- rbbb rbbr rble rebb rebe rebo rebu reeb reef reel reet refe reff refl refr reft refu relb rele rell relo relt reof reol reot reou rere rero rert reru rete reto retr rett reue reuf reul reut reuu rfef rffl rlee rlef rleu rob- robb robe robo robt robu roel roer roet rofe roff rofl rofo role rolf roll rolo rolt roob roof rool roor root rore roro rort roru rote rotl roto rotr rott roub roue rouf roul rout rrle rrrr rtbf rtee rtfb rtle rtlt rubb rube rubu ruel ruer ruet rufe ruff rufo ruft rule rull rulo rure ruro ruru rute rutl ruto rutt rutu tbrb tebo tebu teef teel teer teet teff tefl teft tel- tele tell telo telt telu teor ter- tere terf tero terr teru tete teto tetr tett tetu teut tfeb tfot tobe tobo tobt tobu toee toer toet toff tofo toft tofu tol- tole toll tolo tolt tolu toof tool toor toot tore torf toro torr tort toru tote toto totr tott toul tour tout tre- tree tref treo tret treu trfr troe troo trot trou trte trtr trub true trut truu ttbb tteo tter ttff ttoe tttt ttul tubb tube tubo tubr tubu tuel tuer tuet tufe tuff tufo tuft tufu tule tull tulo tulu tuor turb ture turf turo turr turt turu tute tutl tuto tutt tutu tuuo ubbe ubbo uber ubet uble ublo ubtf uele uell ufel ufer uffe uleb ulee uleo ulfe ulft ulle ullo ullr ulo- ulto ultt ulul uofl uofo uor- uore urbe ure- uret urfe urff urft urle uro- urol uroo urre urte urur urut utel uter utfo utor utto uttu uulu uutf uuuu

-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