bbbb bbci bbeb bbrc bcbc bccc bcci bcec bcer bcie bebb bebe bebi beci beeb beer beic beir berc bere beri berr bibb bibe bibi bicc bice bici bieb bier birb bire biri birr brcb brce breb brec bree brei brer bric brie brrr cbbc cbcc cbce cbcr cbec cbee cber cbir cbre ccbc cccb cccc ccci ccee ccic ccii ccir ccrc ccre ccri cec- cece ceci ceeb ceec cer- cerc cere ceri cibc cibe cibi cicc cici cicr ciee cier ciii cirb circ cire ciri cirr crbc crcc crce crcr cre- creb crec cree crei crib cric crie ebbc ebbr ebcc eber ebic ecbc ecbe eccb eccc ecce ecci ecib ecrc ecri ecrr eeee eerc eiec eiei eier eire erbb erbe ercc erce ereb erec erei erer eric erie errc erre i-be ibec ibie ibrc ibri icbc iccb iccc icci iccr icec icee icer icrc icre icrr iecc ieie iere ieri iiie iiii iirc irbe ircc iree irer iri- iric irie irrc irre irri rbbb rbbr rcbc rccb rccc rcic rebb rebe recc rece reci recr reeb reii reir rere reri rib- ribe ricc rice rier rire riri rrrr