bbbb bbci bbeb bbrc bcbc bccc bcci bcec bcer bcie bebb bebe bebi beby beci beeb beer beey beic beir berc bere beri berr bery beye beyi bibb bibe bibi bicc bice bici bieb bier birb bire biri birr biry brcb brce breb brec bree brei brer brey bric brie brrr bry- brye byce byer byre cbbc cbcc cbce cbcr cbec cbee cber cbir cbre cbry ccbc cccb cccc ccci ccee ccic ccii ccir ccrc ccre ccri cec- cece ceci ceeb ceec cer- cerc cere ceri cery 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 cry- cryb cybb cybc cybi cyc- cycb cycc cyre cyy- cyyc ebbc ebbr ebby ebcc eber ebic ecbc ecbe eccb eccc ecce ecci ecib ecrc ecri ecrr eeby eeee eerc eery eiec eiei eier eire eiry erbb erbe ercc erce ereb erec erei erer eric erie errc erre eryc erye eyeb eyec eyer eyey eyir eyre eyry eyyr i-be i-by ibec ibie ibrc ibri ibyi icbc iccb iccc icci iccr icec icee icer icey icrc icre icrr icry iecc ieie iere ieri iiie iiii iirc irbe irby ircc iree irer iri- iric irie iriy irrc irre irri iyer iyre rbbb rbbr rcbc rccb rccc rcic rcyc rebb rebe recc rece reci recr recy reeb reii reir rere reri rery reye rib- ribe riby ricc rice rier rire riri rrrr rybe ryeb yber ybry yccc ycee ycie yeer yeie yeii yeir yerb yere yeri yerr yery yeye yeyi yeyr yirb yire yirr yyyy