b-u bbb bbc bbd bbk bbn bbo bbr bbu bcb bcc bcd bck bcn bco bcr bcu bdb bdc bdd bdk bdo bdr bdu bkb bkc bkk bkn bko bkr bnb bnc bnd bnk bnn bno bnr bnu bob boc bod bok bon boo bor bou brb brd brk brn bro brr bru bub buc bud buk bun buo bur buu c-- cbb cbc cbd cbk cbn cbo cbr cbu ccb ccc ccd cck ccn cco ccr ccu cdb cdc cdd cdk cdn cdo cdr cdu ckb ckc ckd cko cn- cnb cnc cnd cnn cno cnr cnu co- cob coc cod cok con coo cor cou crb crc crd crk crn cro crr cru cub cuc cud cuk cun cuo cur cuu dbb dbc dbd dbk dbn dbo dbr dbu dcb dcc dcd dck dcn dco dcr dcu ddb ddc ddd ddk ddn ddo ddr ddu dkb dkc dkk dko dkr dku dnb dnc dnd dnk dnn dno dnr dob doc dod dok don doo dor dou drb drc drd drk drn dro drr dru dub duc dud duk dun duo dur kbb kbc kbd kbk kbn kbo kbr kbu kcb kcc kcd kck kcn kcr kcu kdb kdc kdk kdo kdr kdu kkb kkc kkk kkn kkr kku kn- knc knd knk knn kno knr knu kob koc kod kok kon koo kor kou krc krd krk krn kro krr kru kub kuc kud kuk kun kur kuu nbb nbc nbd nbk nbn nbo nbr nbu ncb ncc ncd nck ncn nco ncr ncu ndb ndc ndd ndk ndn ndo ndr ndu nkc nkk nkn nko nkr nku nnb nnc nnk nnn nno nnu no- nob noc nod nok non noo nor nou nrb nrc nrd nrk nrn nro nrr nru nub nuc nud nuk nun nuo nur nuu ob- obb obc obd obk obn obo obr obu oc- ocb occ ocd ock ocn oco ocr ocu odb odc odd odn odo odr odu okb okc okd okk oko okr oku on- onb onc ond onk onn ono onr onu oo- oob ooc ood ook oon ooo oor or- orb orc ord ork orn oro orr oru ou- ouc oud ouk oun ouo our rbb rbc rbd rbk rbn rbo rbr rbu rcb rcc rcd rcn rco rcr rcu rdb rdc rdd rdn rdo rdr rdu rkb rkc rkk rko rku rnb rnc rnd rnn rno rnr rnu rob roc rod rok ron roo ror rou rrb rrc rrd rrk rrn rrr rru rub ruc rud ruk run ruo rur ruu ubb ubc ubk ubn ubo ubr ubu ucb ucc ucd uck ucn uco ucr ucu udb udc udd udk udn udo udr udu ukb ukc ukk ukn ukr uku un- unb unc und unk unn uno unr unu uob uoc uod uok uon uoo uor ur- urb urc urd urk urn uro urr uru uuc uun uur uuu

bbbb bbdd bbdo bbrc bcbc bccc bcnu bcor bcru bcuc bd-r bdbc bddc bnoc bnor bnrr bobb bobo bobu bock boco bocu bodb bodo bodu bokn boko boku bonc bond bonk bonn bono bonu boob booc bood book boon boor bor- bord bork born boro borr boru boud bouk boun bour brcb brdo brkb brno brob broc brod brok bron broo bror brou brrr bruc brud brun bubb bubo bubu bucc buck buco bucu budb budd budo budu bukk buko buku bunb bund bunk bunn buno bunu buon bur- burb burd burk burn buro burr buru c-bo c-cd cbbc cbcc cbcn cbcr cbcu cbdb cbdc cbdn cbdo cbkn cbko cbkr cbnd cbrd cbrn ccbc ccbn cccb cccc cccu ccdc ccdn ccdr ccnb ccnc ccnr ccnu ccob ccoc ccod ccrc ccuc cd-r cddb cddr cdnb cdnc cdon ckbc ckck ckco ckdo ckdu cknb cknc ckob ckoc ckoo ckor ckrc ckrd cnbc cnco cndd cnrc cnrr cobb cobo cobu cock coco cocu codd cok- coko con- conc cond conk conn cono coob cood cook coon cor- corb corc cord cork corn coro corr coub coud couk coun cour crbc crbu crcc crcr crdc crkc crob croc crod crok cron croo cror crub crud cruk crun cub- cubb cucc cuck cucn cuk- cund cuno cuon curb curd curn curo curr d-bo dbcc dbrn dcbc dccb dccc dccu dcdb dcon dcrk dddd ddoc ddrc ddub dkdc dnoc dnrc dnuk dobb dobu dock doco docu dod- dodd dodo doko donc dond donk donn dono donr doob dood dook doon door dorc dord dork dorn doro dorr doru doub douc doud douk doun dour drbc drno drob drod dron drou drub druk druu dub- dubb dubc dubu duck duco dudd dudo dudu duku dunc dunk dunn duno duo- duon durk durn duro duru duur kbbb kbbc kbbd kbbk kbbo kbbr kbbu kbcb kbck kbco kbcr kbcu kbdb kbdn kbdo kbdr kbkb kbkk kbko kbkr kbnd kbnn kbno kbnr kbnu kbob kboc kbod kbok kbon kboo kbrb kbrc kbrd kbrk kbrn kbro kbru kbub kbuc kbud kbuk kbun kbur kbuu kcbc kcbd kcbk kcbr kcbu kccb kccc kccd kcck kccr kccu kcdc kcdd kcdr kcdu kckc kckk kckn kcko kckr kcnb kcnd kcno kcnr kcob kcon kcor kcou kcrc kcrn kcro kcrr kcru kcub kcuk kdbb kdbn kdbr kdcc kdcd kdco kdcr kddb kddc kddd kddk kddr kdkb kdkd kdkk kdkn kdko kdkr kdnd kdnk kdnn kdno kdnr kdoc kdok kdrb kdro kdub kduc kdun kdur kkbb kkbd kkbn kkbo kkbr kkcb kkcd kkck kkcn kkco kkcr kkdc kkdd kkdo kkkk kknb kknd kknn kkno kknu kkob kkon kkoo kkor kkrb kkrc kkrk kkrn kkro kkrr kkuu knbb knbc knbn knbr knbu kncb knck kncn knco kncr kncu kndb kndc kndd kndk kndn kndo kndr kndu knkk knnb knnd knnk knnr knob knoc knod knok knon knor knou knrb knrk knro knub knud knuk knur kobb kobc kobk kobn kobo kobr kobu kocb kocd kock kocn kodk kodo kodu kokb kokc kokk kokn koko kokr koku konc kond konk kono koob kooc kook koon kooo koor koou korb korc kord kork korn koro korr koru koub