-er bbb bbc bbe bbk bbo bbr bbs bcb bcc bce bck bco bcr bcs be- beb bec bee bek beo ber bes bkb bkc bke bkk bko bkr bks bob boc boe bok boo bor bos brb bre brk bro brr brs bsb bsc bse bsk bso bsr bss c-- cbb cbc cbe cbk cbo cbr cbs ccb ccc cce cck cco ccr ccs ce- ceb cec cee cek ceo cer ces ckb ckc cko cks co- cob coc coe cok coo cor cos crb crc cre crk cro crr crs csb csc cse csk cso csr css ebb ebc ebe ebk ebo ebr ebs ec- ecb ecc ece eck eco ecr ecs eeb eec eee eek eeo eer ees ekb ekc eke eko ekr eks eo- eob eoc eoe eok eoo eor eos erb erc ere erk ero err ers es- esb esc ese esk eso esr ess kbb kbc kbe kbk kbo kbr kbs kcb kcc kce kck kcr kcs ke- keb kec kee kek keo ker kes kkb kkc kke kkk kkr kks kob koc koe kok koo kor kos krc krk kro krr krs ksb ksc kse ksk kso ksr kss ob- obb obc obe obk obo obr obs oc- ocb occ ock oco ocr ocs oeb oec oee oeo oer oes okb okc oke okk oko okr oks oo- oob ooc ook ooo oor oos or- orb orc ore ork oro orr ors os- osb osc ose osk oso osr oss rbb rbc rbe rbk rbo rbr rbs rcb rcc rce rco rcr rcs re- reb rec ree rek reo rer res rkb rkc rke rkk rko rks rob roc roe rok roo ror ros rrb rrc rrk rrr rrs rsb rsc rse rsk rso rsr rss sbb sbc sbe sbk sbo sbr sbs scb scc sce sck sco scr scs se- seb sec see sek seo ser ses sk- skb skc ske skk sko skr sks sob soc soe sok soo sor sos sr- srb src sre srk sro srr srs ss- ssb ssc sse ssk sso ssr sss

-ose bbbb bbbs bbeb bbrc bcbc bcbs bccc bccs bcec bcer bces bcor bcos bcrs bcsc bcss bebb bebe bebo beck becs beeb beek beer bees beke beko beks beo- beok beor beos berc bere berk bero berr bers bes- bese besk beso bess bobb bobe bobo bobs boce bock boco bocs boec boee boeo boer boes boke boko boks boob booc booe book boor boos bor- bore bork boro borr bors bosc bose bosk boso boss brcb brce breb brec bree brek breo brer bres brkb brob broc broe brok broo bror bros brrr brrs brsb brsr bscs bseb bsec bsee bser bses bsos bssc bsse c-bo cbbc cbbs cbcc cbce cbcr cbcs cbec cbee cber cbko cbkr cbre cbsc cbse ccbc cccb cccc cccs ccee ccob ccoc ccrc ccre ccrs ccss cebs cec- cece ceco cecs ceeb ceec cees ceke ceor ceos cer- cerc cere cero cers cesc cese cesr cess ckbc ckbe ckck ckco ckcs cker ckob ckoc ckoo ckor ckos ckrc cksb ckso cobb cobe cobo cobs coce cock coco coes cok- coke coko coob cook coos cor- corb corc core cork coro corr cors cosc cose coso coss crbc crcc crce crcr cre- creb crec cree creo cres crkc crob croc croe crok croo cror crss cscb cscc csce csco cscr cscs csec csee cser csks csob csor csos csrc csrs csse cssr ebbc ebbo ebbr ebbs ebcc eber ebes eboe eboo ebor ebos ebro ecbc ecbe eccb eccc ecce ecco eces ecko ecks eco- ecos ecrc ecrr ecsc ecse ecss eecs eeee eees eeke eeks eeoc eerc eero eers eese eesk ekco ekeb ekek eker ekes ekos eoes eore erbb erbe ercc erce ereb erec erer eres erke erks erob eroc eroe eroo eros errc erre erro errs erse erso esbo esbs escb esce esco escr escs esee esek eseo eser eses eske esko esks eso- esok esos esse esso k-os kbbb kbbc kbbe kbbk kbbo kbbr kbbs kbcb kbce kbck kbco kbcr kbcs kbeb kbec kbee kbek kbeo kber kbes kbkb kbkk kbko kbkr kbob kboc kboe kbok kboo kbos kbrb kbrc kbre kbrk kbro kbsb kbsk kbso kbsr kbss kcbc kcbk kcbr kcbs kccb kccc kcck kccr kceb kcec kcee kceo kckc kckk kcko kckr kcob kcoe kcor kcos kcrc kcro kcrr kcrs kcsb kcsc kcse kcsr kcss kebb kebc kebe kebr keck keco kecr keek keer kees kekb kekc keke keko keks keok keos ker- kerb kerc kere kerk kero kerr kers kesb kesc kesk keso kesr kess kkbb kkbe kkbo kkbr kkbs kkcb kkck kkco kkcr kkcs kkkk kkob kkoo kkor kkrb kkrc kkre kkrk kkro kkrr kkrs kkse kksr kkss kobb kobc kobe kobk kobo kobr kobs kocb kock kocs koes kokb kokc koke kokk koko kokr koks koob kooc kook kooo koor koos korb korc kore kork koro korr kors kos- kosb kosc kose koso kosr koss krbb krbe krbk krbr krcb krcc krce krco krcs kreb krec kree krek kreo kres krkc krke krkk krko krkr krks krob kroc kroe krok kroo kror kros krrb krrc krre krrk krro krrr krrs krsc krse krsk krsr krss ksbc ksbr ksbs kscb ksce ksck ksco kscr kscs ksec ksee ksek kseo kser kskb kske kskk ksko kskr ksks ksob ksoc ksok ksoo ksor ksos ksrb ksro ksrr ksrs ksse ksso kssr ksss o-eo obbo obec ober obes obkb oboe obok obor obos obre obro obsr obss ocbc occc oce ocee ocke ocks ocos ocre ocro ocrr ocrs oec- oecc oeec oere oers oese oker okes okko okok okor okre okro okso oobe oocr ooer ooes oooo ooos oore oose orbb orbe orbo orbs orce orco orcs ore- oreb orec orek oreo orer ores orke orko oro- oroe orok oror oros orro orrs orse orsk orso osbe oscc osce osco osec osee osek oser oses osoo osor osos osro ossb osse osso rbbb rbbr rbbs rbss rcbc rcbo rccb rccc rccs rcos rcsc rcss