bbbb bbci bbeb bbrc bcbc bccc bcci bcec bcer bcie bcor bebb bebe bebi bebo beci beeb beer beic beir beo- beor berc bere beri bero berr bibb bibe bibi bibo bicc bice bici bico bieb bier bio- bioc bioi birb bire biri biro birr bobb bobe bobi bobo boce boco boec boee boeo boer boi- boie boii boob booc booe boor bor- bore bori boro borr brcb brce breb brec bree brei breo brer bric brie brio brob broc broe broo bror brrr c-bo cbbc cbcc cbce cbcr cbec cbee cber cbir cbre ccbc cccb cccc ccci ccee ccic ccii ccir ccob ccoc ccrc ccre ccri cec- cece ceci ceco ceeb ceec ceor cer- cerc cere ceri cero cibc cibe cibi cibo cicc cici cico cicr ciee cier ciii ciob cior cirb circ cire ciri ciro cirr cobb cobe cobi cobo coce coco coir coob cor- corb corc core cori coro corr crbc crcc crce crcr cre- creb crec cree crei creo crib cric crie crob croc croe croo cror ebbc ebbo ebbr ebcc eber ebic eboe eboo ebor ebro ecbc ecbe eccb eccc ecce ecci ecco ecib eco- ecrc ecri ecrr eeee eeoc eerc eero eico eiec eiei eier eire eoir eore eori erbb erbe ercc erce ereb erec erei erer eric erie erio erob eroc eroe eroi eroo errc erre erro i-be ibec ibie ibrc ibri ibro icbc iccb iccc icci icco iccr icec icee icer icoc icor icrc icre icrr iecc ieie ieio iere ieri iiie iiii iiio iioi iioo iirc iobi ioci ioee ioii ioio iooi iooo iore iori irbe ircc iree irer iri- iric irie irio irob iroc irrc irre irri o-eo obbo obec ober obie oboe oboi obor obre obri obro ocbc occc occi oce ocee ocre ocro ocrr oec- oecc oeec oere oici oier oiii oire oobe oobi oocr ooer oooo oore orbb orbe orbi orbo orce orci orco ore- oreb orec oreo orer ori- oric orie orio oro- oroe oror orri orro rbbb rbbr rcbc rcbo rccb rccc rcic rebb rebe rebo recc rece reci recr reeb reii reir rere reri rero rib- ribe ribo ricc rice rico rier rire riri rob- robb robe robi robo rocc roce roco roer roio roir roob rooi roor rorc rore rori roro rrrr