bbbb bbdd bbeb bbrc bcbc bccc bcde bcec bcer bd-r bdbc bddc bebb bebe beck bede beeb beed beek beer beke berc berd bere berk berr brcb brce breb brec bred bree brek brer brkb brrr c-cd cbbc cbcc cbce cbcr cbdb cbdc cbec cbee cber cbkr cbrd cbre ccbc cccb cccc ccdc ccdr cced ccee ccrc ccre cd-e cd-r cddb cddr cdec cder cdre cec- cece cedd cede ceeb ceec ceke cer- cerc cerd cere ckbc ckbe ckck cker ckrc ckrd crbc crcc crce crcr crdc cre- creb crec cred cree crkc dbcc dcbc dccb dccc dcdb dcrk dddd ddrc ddre debe dec- decc decd dece deck dedd dede deeb deed deek deer dek- deke der- derb derc dere derk derr dkdc drbc dred dree drek ebbc ebbr ebcc ebed eber ecbc ecbe eccb eccc ecce ecdc eced ecrc ecrr eddc edde ede- eder eede eeee eeke eerc ekeb eked ekek eker erbb erbe ercc erce erde ereb erec ered erer erke errc erre kbbb kbbc kbbd kbbe kbbk kbbr kbcb kbce kbck kbcr kbdb kbde kbdr kbeb kbec kbed kbee kbek kber kbkb kbkk kbkr kbrb kbrc kbrd kbre kbrk kcbc kcbd kcbk kcbr kccb kccc kccd kcck kccr kcdc kcdd kcdr kceb kcec kced kcee kckc kckk kckr kcrc kcrr kdbb kdbr kdcc kdcd kdce kdcr kddb kddc kddd kddk kddr kdeb kdec kdkb kdkd kdkk kdkr kdrb kebb kebc kebe kebr keck kecr kedb kedc kedd kede kedr keed keek keer kekb kekc keke ker- kerb kerc kere kerk kerr kkbb kkbd kkbe kkbr kkcb kkcd kkck kkcr kkdc kkdd kked kkkk kkrb kkrc kkre kkrk kkrr krbb krbd krbe krbk krbr krcb krcc krcd krce krdc krdd krde krdr kreb krec kred kree krek krkc krkd krke krkk krkr krrb krrc krre krrk krrr rbbb rbbr rcbc rccb rccc rcdc rcde rcrd rder rebb rebe rebk recc recd rece reck recr redc redd rede redr reeb reed reek reke rerd rere rred rrrr