bbbb bbci bbdd bbeb bbrc bcbc bccc bcci bcde bcec bcer bcie bd-r bdbc bddc bdii bebb bebe bebi beci bede bedi beeb beed beer beic beir berc berd bere beri berr bibb bibe bibi bicc bice bici bide bidi bidr bieb bied bier birb bird bire biri birr brcb brce breb brec bred bree brei brer bric brid brie brrr c-cd cbbc cbcc cbce cbcr cbdb cbdc cbdi cbec cbee cber cbid cbir cbrd cbre ccbc cccb cccc ccci ccdc ccdi ccdr cced ccee ccic ccid ccii ccir ccrc ccre ccri cd-e cd-r cddb cddr cdec cder cdic cdii cdre cec- cece ceci cedd cede cedi ceeb ceec cer- cerc cerd cere ceri cibc cibe cibi cicc cici cicr cidc cide cidi cidr ciee cier ciid ciii cirb circ cire ciri cirr crbc crcc crce crcr crdc cre- creb crec cred cree crei crib cric crie dbcc dcbc dccb dccc dcci dcdb dcii dddd ddie ddrc ddre debe debi dec- decc decd dece deci dedd dede dedi deeb deed deer deid deie deir der- derb derc dere deri derr dibb dibe dice dici dide didi dieb died dier diii dird dire dirr drbc dred dree drei drib dric drie ebbc ebbr ebcc ebed eber ebic ebid ecbc ecbe eccb eccc ecce ecci ecdc eced ecib ecrc ecri ecrr eddc edde eddi ede- edei eder edie eede eeee eerc eid- eide eidi eidr eiec eied eiei eier eird eire erbb erbe ercc erce erde erdi ereb erec ered erei erer eric erie errc erre i-be ibec ibed ibid ibie ibrc ibrd ibri icbc icbd iccb iccc icci iccr icdc icdd icde icec iced icee icer icrc icre icrr idbe idce idcr idec ided idee ider idic idid idie idir idrc idre iecc iedr ieie iere ieri iicd iide iied iiie iiii iirc irbe ircc ircd irdc ired iree irer iri- iric irid irie irrc irre irri rbbb rbbr rcbc rccb rccc rcdc rcde rcic rcid rcrd rder rebb rebe recc recd rece reci recr redc redd rede redi redr reeb reed reid reii reir rerd rere reri rib- ribe ricc rice ridc ridd ride ridi ried rier rire riri rred rrrr