bbbb bbeb bblb bebb bebe bebo beeb beel beer bele bell belo belu beo- beor bere bero berr beru beur bevo bleb blee bleo bleu blob bloo blou blub blue blur bobb bobe bobo bobu boee boel boeo boer bole boll bolo bolu boob booe bool boor bor- bore boro borr boru boue boul bour bove bovo breb bree brel breo brer brev brob broe brol broo bror brou brrr brue bruv bubb bube bubo bubu buel buer bueu bulb bule bull bulu buol bur- burb bure burl buro burr buru buve ebbo ebbr ebel eber eboe ebol eboo ebor ebro ebru ebul ebur eeee eele eelv eero el-b elbe elbo elbu elee eleo eler elev elle ello ellu elro elue elul elve elvo eole eolo eore eorl erbb erbe ereb erel erer erev erle erll erob eroe erol eroo erre erro erub erur eruv erve euer eule eur- eure euro evel ever evoe evol evoo evre lblr le-u lebo lebu leel leer lele lell lelo lelu leor leou leov lere lero leur lev- leve levo lleu llll lloo lo-v lob- lobb lobe lobo loeb loeu lole loll lolo loob looe lool loor lore loro loue loul lour louu love lovo lrrr lube luer lule lull lulu lure lurv luve lvov lvrr o-eo obbo obel ober oble oblu oboe obol obor obre obro oele oere olbo ole- oleo oler olev olle ollo olor olov olur oobe ooer oolo oooo oore orbb orbe orbo orbu ore- oreb orel oreo orer orle orlo orlu oro- oroe oror orro orub orve orvr ouer oule oulu our- oure ouro ouu- ovee over ovo- ovol ovoo ovre rbbb rbbr rble rebb rebe rebo rebu reeb reel reev relb rele rell relo reol reou rere rero reru reue reul reuu reve revo rlee rleu rob- robb robe robo robu roel roer roev role roll rolo roob rool roor rore roro roru roub roue roul rove rovo rrle rrrr rubb rube rubu ruel ruer rule rull rulo rure ruro ruru ruve ruvu rver ubbe ubbo uber uble ublo uele uell uleb ulee uleo ulle ullo ullr ulo- ulul uor- uore uovo urbe ure- urle uro- urol uroo urre urur urve uulu uuuu uv-b uvel uver uvvu veel veer vel- vele vell velo velu veol veor ver- verb vere verl vero veur veve vevo voel voer voeu vole voll volo vool voor vor- vore voro voru voue voul vour vrbl vreo vuel vull vurb vver vvob vvvv