-ic bbb bbc bbi bbk bbo bbr bbs bcb bcc bci bck bco bcr bcs bi- bib bic bii bik bio bir bis bkb bkc bkk bko bkr bks bob boc boi bok boo bor bos brb bri brk bro brr brs bsb bsc bsi bsk bso bsr bss c-- cbb cbc cbi cbk cbo cbr cbs ccb ccc cci cck cco ccr ccs ci- cib cic cii cik cio cir cis ckb ckc cki cko cks co- cob coc coi cok coo cor cos crb crc cri crk cro crr crs csb csc csi csk cso csr css ibb ibc ibi ibk ibo ibr ibs icb icc ici ick ico icr ics iib iic iii iio iir iis ikb ikc iki ikk iko ikr iks io- iob ioc ioi ioo ior ios ir- irb irc iri irk iro irr irs is- isb isc isi isk iso isr iss kbb kbc kbi kbk kbo kbr kbs kcb kcc kci kck kcr kcs kib kic kii kik kio kir kis kkb kkc kki kkk kkr kks kob koc koi kok koo kor kos krc kri krk kro krr krs ksb ksc ksi ksk kso ksr kss o-i ob- obb obc obi obk obo obr obs oc- ocb occ oci ock oco ocr ocs oib oic oii oik oio oir ois okb okc oki okk oko okr oks oo- oob ooc ooi ook ooo oor oos or- orb orc ori ork oro orr ors os- osb osc osi osk oso osr oss rbb rbc rbi rbk rbo rbr rbs rcb rcc rci rco rcr rcs rib ric rii rik rio rir ris rkb rkc rkk rko rks rob roc roi rok roo ror ros rrb rrc rri rrk rrr rrs rsb rsc rsi rsk rso rsr rss sbb sbc sbi sbk sbo sbr sbs scb scc sci sck sco scr scs sib sic sii sik sio sir sis sk- skb skc ski skk sko skr sks sob soc soi sok soo sor sos sr- srb src sri srk sro srr srs ss- ssb ssc ssi ssk sso ssr sss

bbbb bbbs bbci bbrc bcbc bcbs bccc bcci bccs bcis bcor bcos bcrs bcsc bcss bibb bibi bibo bibs bicc bici bick bico bics biis biko bio- bioc bioi bios birb biri birk biro birr birs bis- bisc bisk biso biss bobb bobi bobo bobs bock boco bocs boi- boii bois boki boko boks boob booc book boor boos bor- bori bork boro borr bors bosc bosi bosk boso boss brcb bric brik brio bris brkb brob broc brok broo bror bros brrr brrs brsb brsr bsci bscs bsic bsos bssc c-bo cbbc cbbs cbcc cbcr cbcs cbir cbko cbkr cbsc cbsi ccbc cccb cccc ccci cccs ccic ccii ccir ccis ccob ccoc ccrc ccri ccrs ccsi ccss cibc cibi cibo cicc cici cico cicr cics ciii ciis ciko cikr ciob cior cios cirb circ ciri cirk ciro cirr cirs cis- cisc cisk cisr ciss ckbc ckbi ckck ckco ckcs ckob ckoc ckoi ckoo ckor ckos ckrc cksb ckso cobb cobi cobo cobs cock coco coir cois cok- coko coob cook coos cor- corb corc cori cork coro corr cors cosc cosi coso coss crbc crcc crcr crib cric crik cris crkc crob croc crok croo cror crss cscb cscc csci csco cscr cscs csib csik csio csir csis csks csob csor csos csrc csrs cssr ibcs ibis ibos ibrc ibri ibro ibss icbc icbs iccb iccc icci icco iccr iccs icis icks icoc icor icos icrc icrr icrs icsb icsc icsi icsr icss iiii iiio iiis iioi iioo iios iirc iirs iisc iisi iisr ikki ikko ikoo ikri iobi ioci ioii ioio ioko iooi iooo ioos iori iors ioso ircc ircs iri- iric irio iris irki irks irob iroc irrc irri irrs iscc isci isco iscr iscs isic isis isko iso- isoc isok isor isos isri issc issi isso issr isss k-ci k-os kbbb kbbc kbbi kbbk kbbo kbbr kbbs kbcb kbci kbck kbco kbcr kbcs kbib kbic kbik kbio kbis kbkb kbkk kbko kbkr kbob kboc kboi kbok kboo kbos kbrb kbrc kbri kbrk kbro kbsb kbsi kbsk kbso kbsr kbss kcbc kcbi kcbk kcbr kcbs kccb kccc kcci kcck kccr kcic kcii kcir kcis kckc kckk kcko kckr kcob kcor kcos kcrc kcri kcro kcrr kcrs kcsb kcsc kcsi kcsr kcss kibb kibc kibi kibo kibr kibs kicb kicc kick kicr kics kiic kiii kiik kiis kikc kiki kikk kiko kikr kioc kioi kiok kioo kirb kirc kiri kirk kiro kirr kirs kisc kisi kisk kiso kisr kiss kkbb kkbi kkbo kkbr kkbs kkcb kkci kkck kkco kkcr kkcs kkic kkik kkkk kkob kkoo kkor kkrb kkrc kkrk kkro kkrr kkrs kksi kksr kkss kobb kobc kobi kobk kobo kobr kobs kocb koci kock kocs koii koir kokb kokc koki kokk koko kokr koks koob kooc kooi kook kooo koor koos korb korc kori kork koro korr kors kos- kosb kosc kosi koso kosr koss krbb krbi krbk krbr krcb krcc krci krco krcs krib krik krio kris krkc krki krkk krko krkr krks krob kroc kroi krok kroo kror kros krrb krrc krri krrk krro krrr krrs krsc krsk krsr krss ksbc ksbi ksbr ksbs kscb ksci ksck ksco kscr kscs ksib ksii ksik ksir ksis kskb kskk ksko kskr ksks ksob ksoc ksoi ksok ksoo ksor ksos ksrb ksro ksrr ksrs kssi ksso kssr ksss obbo obis obkb oboi obok obor obos obri obro obsr obss ocbc occc occi ocis ocks ocos ocro ocrr ocrs oici oick oiii oiko oiks oios oisc okic okir okko okok okor okro oksi okso oobi oocr oooo ooos oosi orbb orbi orbo orbs orci orco orcs ori- oric orio oris orko oro- orok oror oros orri orro orrs orsi orsk orso oscc osci osco osii osik osis oski osoi osoo osor osos osro ossb ossi osso rbbb rbbr rbbs rbis rbss rcbc rcbo rccb rccc rccs rcic rcis rcos rcsc rcsi rcss rib- ribo ribs ricc rick rico rics riis riki rikk