bbbb bbeb bbrc bcbc bccc bcec bcer bcor bebb bebe bebo beck beeb beek beer beke beko beo- beok beor berc bere berk bero berr bobb bobe bobo boce bock boco boec boee boeo boer boke boko boob booc booe book boor bor- bore bork boro borr brcb brce breb brec bree brek breo brer brkb brob broc broe brok broo bror brrr c-bo cbbc cbcc cbce cbcr cbec cbee cber cbko cbkr cbre ccbc cccb cccc ccee ccob ccoc ccrc ccre cec- cece ceco ceeb ceec ceke ceor cer- cerc cere cero ckbc ckbe ckck ckco cker ckob ckoc ckoo ckor ckrc cobb cobe cobo coce cock coco cok- coke coko coob cook cor- corb corc core cork coro corr crbc crcc crce crcr cre- creb crec cree creo crkc crob croc croe crok croo cror ebbc ebbo ebbr ebcc eber eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecco ecko eco- ecrc ecrr eeee eeke eeoc eerc eero ekco ekeb ekek eker eore erbb erbe ercc erce ereb erec erer erke erob eroc eroe eroo errc erre erro kbbb kbbc kbbe kbbk kbbo kbbr kbcb kbce kbck kbco kbcr kbeb kbec kbee kbek kbeo kber kbkb kbkk kbko kbkr kbob kboc kboe kbok kboo kbrb kbrc kbre kbrk kbro kcbc kcbk kcbr kccb kccc kcck kccr kceb kcec kcee kceo kckc kckk kcko kckr kcob kcoe kcor kcrc kcro kcrr kebb kebc kebe kebr keck keco kecr keek keer kekb kekc keke keko keok ker- kerb kerc kere kerk kero kerr kkbb kkbe kkbo kkbr kkcb kkck kkco kkcr kkkk kkob kkoo kkor kkrb kkrc kkre kkrk kkro kkrr kobb kobc kobe kobk kobo kobr kocb kock kokb kokc koke kokk koko kokr koob kooc kook kooo koor korb korc kore kork koro korr krbb krbe krbk krbr krcb krcc krce krco kreb krec kree krek kreo krkc krke krkk krko krkr krob kroc kroe krok kroo kror krrb krrc krre krrk krro krrr o-eo obbo obec ober obkb oboe obok obor obre obro ocbc occc oce ocee ocke ocre ocro ocrr oec- oecc oeec oere oker okko okok okor okre okro oobe oocr ooer oooo oore orbb orbe orbo orce orco ore- oreb orec orek oreo orer orke orko oro- oroe orok oror orro rbbb rbbr rcbc rcbo rccb rccc rebb rebe rebk rebo recc rece reck recr reeb reek reke reko rere rero rob- robb robe robo rocc roce rock roco roer roke rokk roko rokr roob rook roor rorc rore rork roro rrrr