bbbb bbeb bblb bbrc bcbc bccc bccl bcec bcer bcru bcuc bebb bebe becu beeb beel beer bele bell belu berc bere berr beru beur blcu bleb blee bleu blrc blub blue blur brcb brce breb brec bree brel brer brrr bruc brue bubb bube bubu bucc buce bucu buel buer bueu bulb bule bull bulu bur- burb bure burl burr buru cbbc cbcc cbce cbcl cbcr cbcu cbec cbee cber cblb cblc cbre cbrl ccbc cccb cccc cccl cccu ccee ccel cclc ccrc ccre ccrl ccuc cebu cec- cece ceeb ceec ceel cel- celc cele cell cer- cerc cere cerl clec clee cler cleu club clue crbc crbu crcc crce crcr cre- creb crec cree creu crub crue cub- cubb cube cucc cuce cuer culb culc cule cull curb cure curl curr e-cl ebbc ebbr ebcc ebel eber ebru ebul ebur ecbc ecbe eccb eccc ecce eccl ecrc ecrl ecrr ecru eeee eele eerc el-b elbe elbu elcb elce elec elee eler elle ellu elue elul erbb erbe ercc erce ereb erec erel erer erle erll errc erre erub eruc erur eubc euer eule eur- eurc eure lbcc lblr lcbc lccc lcce lcer lcrl le-u lebu lece leel leer lele lell lelu lerc lere leuc leur llcc lleu lllc llll lrrc lrrr lube luce luer lule lull lulu lure rbbb rbbr rbcl rble rcbc rccb rccc rcle rebb rebe rebu recc rece recr recu reeb reel relb rele rell rere reru reue reul reuu rlee rleu rrle rrrr rubb rube rubu ruce ruel ruer rule rull rurc rure ruru ubbe uber uble ucbc ucel ucrc uele uell ulbc ulcc uleb ulee ulle ullr ulul urbe ure- urle urre urur uulu uuuu