bbbb bbdd bbeb bbrc bcbc bccc bcde bcec bcer bcru bcuc bd-r bdbc bddc bebb bebe beck becu bede bedu beeb beed beek beer beke berc berd bere berk berr beru beuk beur brcb brce breb brec bred bree brek brer brkb brrr bruc brud brue bubb bube bubu bucc buce buck bucu budb budd bude budu buer bueu buke bukk buku bur- burb burd bure burk burr buru c-cd cbbc cbcc cbce cbcr cbcu cbdb cbdc cbec cbee cber cbkr cbrd cbre ccbc cccb cccc cccu ccdc ccdr cced ccee ccrc ccre ccuc cd-e cd-r cddb cddr cdec cder cdre cebu cec- cece cedd cede cedu ceeb ceec ceke cer- cerc cerd cere ckbc ckbe ckck ckdu cker ckrc ckrd crbc crbu crcc crce crcr crdc cre- creb crec cred cree creu crkc crub crud crue cruk cub- cubb cube cucc cuce cuck cude cued cuek cuer cuk- cuke curb curd cure curr dbcc dcbc dccb dccc dccu dcdb dcrk dddd ddrc ddre ddub debe debu dec- decc decd dece deck dedd dede dedu deeb deed deek deer dek- deke der- derb derc dere derk derr deue deuk deur dkdc drbc dred dree drek drub drue druk druu dub- dubb dubc dube dubu duce duck dudd dude dudu duer duke duku dure durk duru duur ebbc ebbr ebcc ebed eber ebru ebur ecbc ecbe eccb eccc ecce ecdc eced ecrc ecrr ecru eddc edde ede- eder edru educ edur eede eedu eeee eeke eerc ekeb eked ekek eker ekur erbb erbe ercc erce erde ereb erec ered erer erke errc erre erub eruc erur eubc eucd eude euer eur- eurc eure kbbb kbbc kbbd kbbe kbbk kbbr kbbu kbcb kbce kbck kbcr kbcu kbdb kbde kbdr kbeb kbec kbed kbee kbek kber kbkb kbkk kbkr kbrb kbrc kbrd kbre kbrk kbru kbub kbuc kbud kbue kbuk kbur kbuu kcbc kcbd kcbk kcbr kcbu kccb kccc kccd kcck kccr kccu kcdc kcdd kcdr kcdu kceb kcec kced kcee kceu kckc kckk kckr kcrc kcrr kcru kcub kcue kcuk kdbb kdbr kdcc kdcd kdce kdcr kddb kddc kddd kddk kddr kdeb kdec kdkb kdkd kdkk kdkr kdrb kdub kduc kdur kebb kebc kebe kebr kebu keck kecr kedb kedc kedd kede kedr keed keek keer kekb kekc keke keku ker- kerb kerc kere kerk kerr keru keur kkbb kkbd kkbe kkbr kkcb kkcd kkck kkcr kkdc kkdd kked kkkk kkrb kkrc kkre kkrk kkrr kkuu krbb krbd krbe krbk krbr krcb krcc krcd krce krcu krdc krdd krde krdr krdu kreb krec kred kree krek kreu krkc krkd krke krkk krkr krku krrb krrc krre krrk krrr kruc krue kruk krur kubb kubc kubd kube kubr kubu kucb kucc kucd kuce kucr kudd kude kudu kued kuek kueu kuke kukk kuku kurb kurd kure kurk kurr kuru kuub kuuk kuur kuuu rbbb rbbr rcbc rccb rccc rcdc rcde rcrd rder rebb rebe rebk rebu recc recd rece reck recr recu redc redd rede redr redu reeb reed reek reke rerd rere reru reue reuk reuu rred rrrr rubb rube rubu ruce ruck rudd rude rued ruer ruke rukk ruku rurc rurd rure ruru ruud ubbe ubek uber ubud ucbc ucdc ucdd ucrc udbc uder uduk ukcc ukek ukeu ukrc ukur urbe urde urdu ure- ured urke urre uruk urur uuuu