bbbb bbeb bbet bblb bebb bebe bebo beeb beel beer beet bele bell belo belt belu beo- beor beot bere bero berr bert beru bete beto bett betu betv beur bevo blbt bleb blee bleo blet bleu blob bloo blot blou blub blue blur blut blvt bobb bobe bobo bobu boee boel boeo boer boet bole boll bolo bolt bolu boob booe bool boor boot bor- bore boro borr bort boru botb bote boto bott boue boul bour bout bove bovo breb bree brel breo brer bret brev brob broe brol broo bror brot brou brrr brue brut bruv btob btor btrt bttb bubb bube bubo bubu buel buer bueu bulb bule bull bult bulu buol bur- burb bure burl buro burr burt buru but- bute buto butt buve ebbo ebbr ebel eber eboe ebol eboo ebor ebro ebru ebul ebur eeee eele eelv eero eete eetu el-b elbe elbo elbu elee eleo eler elet elev elle ello ellu elro elte elto elue elul elve elvo eole eolo eore eorl eoto erbb erbe ereb erel erer eret erev erle erll erob eroe erol eroo erre erro ertl ertu erub erur eruv erve etbr etee etel eter etoe etre etro ette etto ettu etvo euer eule eur- eure euro eurt evel ever evet evoe evol evoo evre lblr lbrt le-u lebo lebu leel leer leet lele lell lelo lelu leor leou leov lere lero lert lete leto lett leur lev- leve levo llet lleu llll lloo lo-v lob- lobb lobe lobo loeb loeu lole loll lolo loob looe lool loor loot lore loro lote lotl loto lotr lott lotv loue loul lour lout louu love lovo lrrr lrtv ltbl ltee lttr lttv lube luer lule lull lulu lure lurt lurv lute lutv luve lvov lvrr o-eo obbo obel ober obet oble oblu oboe obol obor obot obre obro oele oere olbo ole- oleo oler olet olev olle ollo olor olot olov oltu olur oobe ooer oolo oooo oore oort ootb orbb orbe orbo orbu ore- oreb orel oreo orer orle orlo orlu oro- oroe oror orot orro orte orto orub orve orvr otee oter oto- otoe otoo otor otov otre otro otte otto ottu otur ouer oule oulu our- oure ouro ourt out- outb oute outo ouu- ovee over ovet ovo- ovol ovoo ovot ovre rbbb rbbr rble rebb rebe rebo rebu reeb reel reet reev relb rele rell relo relt reol reot reou rere rero rert reru rete reto retr rett reue reul reut reuu reve revo rlee rleu rob- robb robe robo robt robu roel roer roet roev role roll rolo rolt roob rool roor root rore roro rort roru rote rotl roto rotr rott roub roue roul rout rove rovo rrle rrrr rtee rtle rtlt rtve rubb rube rubu ruel ruer ruet rule rull rulo rure ruro ruru rute rutl ruto rutt rutu ruve ruvu rver tbrb tebo tebu teel teer teet teev tel- tele tell telo telt telu teor ter- tere tero terr teru tete teto tetr tett tetu teut tevl tobe tobo tobt tobu toee toer toet tol- tole toll tolo tolt tolu tool toor toot tore toro torr tort toru torv tote toto totr tott toul tour tout touv tove tovo tre- tree treo tret treu trev troe troo trot trou trte trtr trub true trut truu trvl ttbb tteo tter ttoe tttt ttul tubb tube tubo tubr tubu tuel tuer tuet tule tull tulo tulu tuor turb ture turo turr turt turu tute tutl tuto tutt tutu tuuo tvel tver tvro tvrr tvtv ubbe ubbo uber ubet uble ublo uele uell uleb ulee uleo ulle ullo ullr ulo- ulto ultt ulul uor- uore uovo urbe ure- uret urle uro- urol uroo urre urte urur urut urve utel uter utor utto uttu uulu uuuu uv-b uvel uver uvvu veel veer veet vel- vele vell velo velt velu veol veor ver- verb vere verl vero vert vete veto vetr veur veve vevo vlvt voel voer voet voeu vole voll volo volt vool voor voot vor- vore voro vort voru vote voto voue voul vour vout vrbl vreo vret vrot vrto vtol vtvl vuel vull vult vurb vurt vutv vver vvob vvvv