bbbb bbeb bblb bbrc bcbc bccc bccl bcec bcer bcor bebb bebe bebo beeb beel beer bele bell belo beo- beor berc bere bero berr bleb blee bleo blob bloc bloo blrc bobb bobe bobo boce boco boec boee boel boeo boer bole boll bolo boob booc booe bool boor bor- bore boro borr brcb brce breb brec bree brel breo brer brob broc broe brol broo bror brrr c-bo cbbc cbcc cbce cbcl cbcr cbec cbee cber cblb cblc cbol cbre cbrl ccbc cccb cccc cccl ccee ccel cclc ccob ccoc ccrc ccre ccrl cec- cece ceco ceeb ceec ceel cel- celc cele cell celo ceol ceor cer- cerc cere cerl cero clec clee cleo cler clob cloe cloo clor clro cobb cobe cobo coce coco coel col- colb cole coll colo coob cool cor- corb corc core corl coro corr crbc crcc crce crcr cre- creb crec cree creo crob croc croe crol croo cror e-cl ebbc ebbo ebbr ebcc ebel eber eboe ebol eboo ebor ebro ecbc ecbe eccb eccc ecce eccl ecco eco- ecol ecrc ecrl ecrr eeee eele eeoc eerc eero el-b elbe elbo elcb elce elco elec elee eleo eler elle ello elro eole eolo eore eorl erbb erbe ercc erce ereb erec erel erer erle erll erob eroc eroe erol eroo errc erre erro lbcc lblr lcbc lccc lcce lcer lcor lcrl lebo lece leco leel leer lele lell lelo leoc leor lerc lere lero llcc lllc llll lloc lloo lob- lobb lobe lobo locc loce loco loeb lole loll lolo loob looc looe lool loor lore loro lroc lrrc lrrr o-eo obbo obec obel ober oble oboe obol obor obre obro ocbc occc oce ocee oclc ocre ocrl ocro ocrr oec- oecc oeec oele oere olbo olcc ole- oleo oler olle ollo olor oobe oocr ooer oolo oooo oore orbb orbe orbo orce orco ore- oreb orec orel oreo orer orle orlo oro- oroe oror orro rbbb rbbr rbcl rble rcbc rcbo rccb rccc rcle rebb rebe rebo recc rece recr reeb reel relb rele rell relo reol rere rero rlee rob- robb robe robo rocc roce roco roel roer role roll rolo roob rool roor rorc rore roro rrle rrrr