b-u bbb bbc bbd bbk bbo bbr bbs bbu bcb bcc bcd bck bco bcr bcs bcu bdb bdc bdd bdk bdo bdr bds bdu bkb bkc bkk bko bkr bks bob boc bod bok boo bor bos bou brb brd brk bro brr brs bru bsb bsc bsd bsk bso bsr bss bsu bub buc bud buk buo bur bus buu c-- cbb cbc cbd cbk cbo cbr cbs cbu ccb ccc ccd cck cco ccr ccs ccu cdb cdc cdd cdk cdo cdr cds cdu ckb ckc ckd cko cks co- cob coc cod cok coo cor cos cou crb crc crd crk cro crr crs cru csb csc csd csk cso csr css csu cub cuc cud cuk cuo cur cus cuu dbb dbc dbd dbk dbo dbr dbs dbu dcb dcc dcd dck dco dcr dcs dcu ddb ddc ddd ddk ddo ddr dds ddu dkb dkc dkk dko dkr dks dku dob doc dod dok doo dor dos dou drb drc drd drk dro drr drs dru dsb dsc dsd dsk dso dsr dss dsu dub duc dud duk duo dur dus kbb kbc kbd kbk kbo kbr kbs kbu kcb kcc kcd kck kcr kcs kcu kdb kdc kdk kdo kdr kds kdu kkb kkc kkk kkr kks kku kob koc kod kok koo kor kos kou krc krd krk kro krr krs kru ksb ksc ksd ksk kso ksr kss ksu kub kuc kud kuk kur kus kuu ob- obb obc obd obk obo obr obs obu oc- ocb occ ocd ock oco ocr ocs ocu odb odc odd odo odr ods odu okb okc okd okk oko okr oks oku oo- oob ooc ood ook ooo oor oos or- orb orc ord ork oro orr ors oru os- osb osc osd osk oso osr oss osu ou- ouc oud ouk ouo our ous rbb rbc rbd rbk rbo rbr rbs rbu rcb rcc rcd rco rcr rcs rcu rdb rdc rdd rdo rdr rds rdu rkb rkc rkk rko rks rku rob roc rod rok roo ror ros rou rrb rrc rrd rrk rrr rrs rru rsb rsc rsd rsk rso rsr rss rsu rub ruc rud ruk ruo rur rus ruu sbb sbc sbd sbk sbo sbr sbs sbu scb scc scd sck sco scr scs scu sdb sdc sdd sdk sdo sdr sds sdu sk- skb skc skd skk sko skr sks sku sob soc sod sok soo sor sos sou sr- srb src srd srk sro srr srs ss- ssb ssc ssd ssk sso ssr sss ssu sub suc sud suk suo sur sus suu ubb ubc ubk ubo ubr ubs ubu ucb ucc ucd uck uco ucr ucs ucu udb udc udd udk udo udr uds udu ukb ukc ukk ukr uku uob uoc uod uok uoo uor uos ur- urb urc urd urk uro urr urs uru usb usc usd usk uso usr uss usu uuc uur uus uuu

-ous bbbb bbbs bbdd bbdo bbrc bcbc bcbs bccc bccs bcds bcor bcos bcrs bcru bcsc bcss bcuc bd-r bdbc bddc bdos bdsd bobb bobo bobs bobu bock boco bocs bocu bodb bodo bods bodu boko boks boku boob booc bood book boor boos bor- bord bork boro borr bors boru bosc bosk boso boss bosu boud bouk bour bous brcb brdo brds brkb brob broc brod brok broo bror bros brou brrr brrs brsb brsr bruc brud brus bsbd bscs bsod bsos bsrd bssc bssd bubb bubo bubs bubu bucc buck buco bucs bucu budb budd budo buds budu bukk buko buku bur- burb burd burk buro burr burs buru busc busk buss busu buus c-bo c-cd cbbc cbbs cbcc cbcr cbcs cbcu cbdb cbdc cbdo cbds cbko cbkr cbrd cbsc cbus ccbc cccb cccc cccs cccu ccdc ccdr ccds ccob ccoc ccod ccrc ccrs ccsd ccss ccuc ccus cd-r cdcs cddb cddr cdos cdrs cdss ckbc ckck ckco ckcs ckdo ckdu ckob ckoc ckoo ckor ckos ckrc ckrd cksb ckso cobb cobo cobs cobu cock coco cocu codd cods cok- coko coob cood cook coos cor- corb corc cord cork coro corr cors cosc coso coss coub coud couk cour cous crbc crbu crcc crcr crdc crkc crob croc crod crok croo cror crss crub crud cruk crus cscb cscc cscd csco cscr cscs csdb csdr csks csob csor csos csrc csrd csrs cssd cssr csur csus cub- cubb cubs cucc cuck cuds cuk- curb curd curo curr curs cusb cusd cusk cuso cuss cusu d-bo dbcc dbcs dbos dbrs dbss dbus dcbc dccb dccc dccs dccu dcdb dcds dcos dcrk dcsc dcss dddd ddoc ddrc ddss ddub dkdc dobb dobs dobu dock doco docs docu dod- dodd dodo dods doko doob dood dook door doos dorc dord dork doro dorr dors doru dosk doso doss doub douc doud douk dour dous drbc drob drod drou drrs drub druk drus druu dsbc dscc dscr dscs dsdr dsos dsrc dsrr dssc dub- dubb dubc dubs dubu duck duco ducs dudd dudo duds dudu duku duo- duos durk duro duru dusk duur k-os kbbb kbbc kbbd kbbk kbbo kbbr kbbs kbbu kbcb kbck kbco kbcr kbcs kbcu kbdb kbdo kbdr kbds kbkb kbkk kbko kbkr kbob kboc kbod kbok kboo kbos kbrb kbrc kbrd kbrk kbro kbru kbsb kbsk kbso kbsr kbss kbsu kbub kbuc kbud kbuk kbur kbus kbuu kcbc kcbd kcbk kcbr kcbs kcbu kccb kccc kccd kcck kccr kccu kcdc kcdd kcdr kcds kcdu kckc kckk kcko kckr kcob kcor kcos kcou kcrc kcro kcrr kcrs kcru kcsb kcsc kcsd kcsr kcss kcsu kcub kcuk kdbb kdbr kdbs kdcc kdcd kdco kdcr kddb kddc kddd kddk kddr kdkb kdkd kdkk kdko kdkr kdoc kdok kdrb kdro kdrs kdsc kdsd kdsk kdsr kdss kdsu kdub kduc kdur kdus kkbb kkbd kkbo kkbr kkbs kkcb kkcd kkck kkco kkcr kkcs kkdc kkdd kkdo kkkk kkob kkoo kkor kkrb kkrc kkrk kkro kkrr kkrs kksd kksr kkss kksu kkus kkuu kobb kobc kobk kobo kobr kobs kobu kocb