bbbb bbeb bblb bebb bebe beeb beel beer bele bell belu bere berr beru beur bleb blee bleu blub blue blur breb bree brel brer brev brrr brue bruv bubb bube bubu buel buer bueu bulb bule bull bulu bur- burb bure burl burr buru buve ebbr ebel eber ebru ebul ebur eeee eele eelv el-b elbe elbu elee eler elev elle ellu elue elul elve erbb erbe ereb erel erer erev erle erll erre erub erur eruv erve euer eule eur- eure evel ever evre lblr le-u lebu leel leer lele lell lelu lere leur lev- leve lleu llll lrrr lube luer lule lull lulu lure lurv luve lvrr rbbb rbbr rble rebb rebe rebu reeb reel reev relb rele rell rere reru reue reul reuu reve rlee rleu rrle rrrr rubb rube rubu ruel ruer rule rull rure ruru ruve ruvu rver ubbe uber uble uele uell uleb ulee ulle ullr ulul urbe ure- urle urre urur urve uulu uuuu uv-b uvel uver uvvu veel veer vel- vele vell velu ver- verb vere verl veur veve vrbl vuel vull vurb vver vvvv