bbb bbc bbd bbk bbo bbr bbs bcb bcc bcd bck bco bcr bcs bdb bdc bdd bdk bdo bdr bds bkb bkc bkk bko bkr bks bob boc bod bok boo bor bos brb brd brk bro brr brs bsb bsc bsd bsk bso bsr bss c-- cbb cbc cbd cbk cbo cbr cbs ccb ccc ccd cck cco ccr ccs cdb cdc cdd cdk cdo cdr cds ckb ckc ckd cko cks co- cob coc cod cok coo cor cos crb crc crd crk cro crr crs csb csc csd csk cso csr css dbb dbc dbd dbk dbo dbr dbs dcb dcc dcd dck dco dcr dcs ddb ddc ddd ddk ddo ddr dds dkb dkc dkk dko dkr dks dob doc dod dok doo dor dos drb drc drd drk dro drr drs dsb dsc dsd dsk dso dsr dss kbb kbc kbd kbk kbo kbr kbs kcb kcc kcd kck kcr kcs kdb kdc kdk kdo kdr kds kkb kkc kkk kkr kks kob koc kod kok koo kor kos krc krd krk kro krr krs ksb ksc ksd ksk kso ksr kss ob- obb obc obd obk obo obr obs oc- ocb occ ocd ock oco ocr ocs odb odc odd odo odr ods okb okc okd okk oko okr oks oo- oob ooc ood ook ooo oor oos or- orb orc ord ork oro orr ors os- osb osc osd osk oso osr oss rbb rbc rbd rbk rbo rbr rbs rcb rcc rcd rco rcr rcs rdb rdc rdd rdo rdr rds rkb rkc rkk rko rks rob roc rod rok roo ror ros rrb rrc rrd rrk rrr rrs rsb rsc rsd rsk rso rsr rss sbb sbc sbd sbk sbo sbr sbs scb scc scd sck sco scr scs sdb sdc sdd sdk sdo sdr sds sk- skb skc skd skk sko skr sks sob soc sod sok soo sor sos sr- srb src srd srk sro srr srs ss- ssb ssc ssd ssk sso ssr sss

bbbb bbbs bbdd bbdo bbrc bcbc bcbs bccc bccs bcds bcor bcos bcrs bcsc bcss bd-r bdbc bddc bdos bdsd bobb bobo bobs bock boco bocs bodb bodo bods boko boks boob booc bood book boor boos bor- bord bork boro borr bors bosc bosk boso boss brcb brdo brds brkb brob broc brod brok broo bror bros brrr brrs brsb brsr bsbd bscs bsod bsos bsrd bssc bssd c-bo c-cd cbbc cbbs cbcc cbcr cbcs cbdb cbdc cbdo cbds cbko cbkr cbrd cbsc ccbc cccb cccc cccs ccdc ccdr ccds ccob ccoc ccod ccrc ccrs ccsd ccss cd-r cdcs cddb cddr cdos cdrs cdss ckbc ckck ckco ckcs ckdo ckob ckoc ckoo ckor ckos ckrc ckrd cksb ckso cobb cobo cobs cock coco codd cods cok- coko coob cood cook coos cor- corb corc cord cork coro corr cors cosc coso coss crbc crcc crcr crdc crkc crob croc crod crok croo cror crss cscb cscc cscd csco cscr cscs csdb csdr csks csob csor csos csrc csrd csrs cssd cssr d-bo dbcc dbcs dbos dbrs dbss dcbc dccb dccc dccs dcdb dcds dcos dcrk dcsc dcss dddd ddoc ddrc ddss dkdc dobb dobs dock doco docs dod- dodd dodo dods doko doob dood dook door doos dorc dord dork doro dorr dors dosk doso doss drbc drob drod drrs dsbc dscc dscr dscs dsdr dsos dsrc dsrr dssc k-os kbbb kbbc kbbd kbbk kbbo kbbr kbbs kbcb kbck kbco kbcr kbcs kbdb kbdo kbdr kbds kbkb kbkk kbko kbkr kbob kboc kbod kbok kboo kbos kbrb kbrc kbrd kbrk kbro kbsb kbsk kbso kbsr kbss kcbc kcbd kcbk kcbr kcbs kccb kccc kccd kcck kccr kcdc kcdd kcdr kcds kckc kckk kcko kckr kcob kcor kcos kcrc kcro kcrr kcrs kcsb kcsc kcsd kcsr kcss 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 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 kobb kobc kobk kobo kobr kobs kocb kocd kock kocs kodk kodo kods kokb kokc kokk koko kokr koks koob kooc kook kooo koor koos korb korc kord kork koro korr kors kos- kosb kosc kosd koso kosr koss krbb krbd krbk krbr krcb krcc krcd krco krcs krdc krdd krdo krdr krds krkc krkd krkk krko krkr krks krob kroc krod krok kroo kror kros krrb krrc krrk krro krrr krrs krsc krsd krsk krsr krss ksbc ksbr ksbs kscb ksck ksco kscr kscs ksdc ksdk ksdr ksds kskb kskd kskk ksko kskr ksks ksob ksoc ksok ksoo ksor ksos ksrb ksro ksrr ksrs ksso kssr ksss obbo obkb obok obor obos obro obsd obsr obss ocbc occc ocds ocks ocos ocro ocrr ocrs odbo oddd odds odoo odor odos odso okko okok okor okro okso oocr oooo ooos oord orbb orbo orbs orco orcs ordo ords orko oro- orok oror oros orro orrs orsk orso oscc osco osoo osor osos osrd osro ossb ossd osso rbbb rbbr rbbs rbds rbsd rbss rcbc rcbo rccb rccc rccs rcdc rcds rcos rcrd rcsc rcsd rcss rdoc rdos rdso rkos rkss rob- robb robo robs rocc rock roco rocs rodd rodo rods rokk roko rokr roks roob rood rook roor roos rorc rork roro rosc roso ross rrrr rscc rscs rsdd rsds rsos s-os sbbs sbcc sbcs sbds sbor sbrk sbsd sccc sccs scdc scds sck- scob scok scoo scor scr- scrc scrs scsc scsd scso scsr sdcc sdco sddc sdds sdrc sdrs sdsc sdss skor sksd skss sobo sobr sobs sock soco socr socs sodd sodo sods sokk soko sood sook soor soos sorb sord soro sorr sors soso soss srbc srcc sros srsd ssbr sscc sscs ssdc ssdd ssoc ssrc ssrs sssb sssc ssss

b-r-k bbook bbsrc bckdk bcock bdoor bo-bo bobko boboc bobok bobos bobr bocks bocor bodd- bodoc bodor