bbbb bbbs bbci bbeb bbrc bcbc bcbs bccc bcci bccs bcec bcer bces bcie bcis bcrs bcsc bcss bebb bebe bebi beci beck becs beeb beek beer bees beic beik beir beis beke beki beks berc bere beri berk berr bers bes- bese besk bess bibb bibe bibi bibs bicc bice bici bick bics bieb bier bies biis bike birb bire biri birk birr birs bis- bisc bise bisk biss brcb brce breb brec bree brei brek brer bres bric brie brik bris brkb brrr brrs brsb brsr bsci bscs bseb bsec bsee bser bses bsic bssc bsse cbbc cbbs cbcc cbce cbcr cbcs cbec cbee cber cbir cbkr cbre cbsc cbse cbsi ccbc cccb cccc ccci cccs ccee ccic ccii ccir ccis ccrc ccre ccri ccrs ccsi ccss cebs cec- cece ceci cecs ceeb ceec cees ceke cer- cerc cere ceri cers cesc cese cesi cesr cess cibc cibe cibi cicc cici cicr cics ciee cier cies ciii ciis cikr cirb circ cire ciri cirk cirr cirs cis- cisc cise cisk cisr ciss ckbc ckbe ckbi ckck ckcs cker ckrc cksb crbc crcc crce crcr cre- creb crec cree crei cres crib cric crie crik cris crkc crss cscb cscc csce csci cscr cscs csec csee cser csib csik csir csis csks csrc csrs csse cssr ebbc ebbr ebbs ebcc eber ebes ebic ebis ecbc ecbe eccb eccc ecce ecci eces ecib ecis ecks ecrc ecri ecrr ecsc ecse ecss eecs eeee eees eeke eeks eerc eers eese eesi eesk eick eics eiec eiei eier eies eike eiki eiks eire eirs eise eisk eiss ekeb ekek eker ekes ekis ekki eksi erbb erbe ercc erce ereb erec erei erer eres eric erie erik eris erke erki erks errc erre errs erse ersi esbs escb esce esci escr escs esee esek eser eses esie esik esis eske esks esri esse essi i-be ibcs ibec ibes ibie ibis ibrc ibri ibss icbc icbs iccb iccc icci iccr iccs icec icee icer ices icis icke icks icrc icre icrr icrs icsb icsc icse icsi icsr icss iecc ieie iere ieri iers iesc iesi iesr iies iiie iiii iiis iirc iirs iisc iisi iisr ikee iker ikes ikki ikri irbe ircc ircs iree irer ires iri- iric irie iris irki irks irrc irre irri irrs irse isbe iscc isci iscr iscs iseb isec isee iser ises isic isie isis isri issc isse issi issr isss k-ci kbbb kbbc kbbe kbbi kbbk kbbr kbbs kbcb kbce kbci kbck kbcr kbcs kbeb kbec kbee kbek kber kbes kbib kbic kbie kbik kbis kbkb kbkk kbkr kbrb kbrc kbre kbri kbrk kbsb kbsi kbsk kbsr kbss kcbc kcbi kcbk kcbr kcbs kccb kccc kcci kcck kccr kceb kcec kcee kcei kcic kcie kcii kcir kcis kckc kckk kckr kcrc kcri kcrr kcrs kcsb kcsc kcse kcsi kcsr kcss kebb kebc kebe kebi kebr keck kecr keek keer kees keib keii keik keir keis kekb kekc keke keki keks ker- kerb kerc kere keri kerk kerr kers kesb kesc kesi kesk kesr kess kibb kibc kibe kibi kibr kibs kicb kicc kice kick kicr kics kier kies kiic kiii kiik kiis kikc kiki kikk kikr kirb kirc kiri kirk kirr kirs kisc kise kisi kisk kisr kiss kkbb kkbe kkbi kkbr kkbs kkcb kkci kkck kkcr kkcs kkic kkik kkkk kkrb kkrc kkre kkrk kkrr kkrs kkse kksi kksr kkss krbb krbe krbi krbk krbr krcb krcc krce krci krcs kreb krec kree krei krek kres krib krik kris krkc krke krki krkk krkr krks krrb krrc krre krri krrk krrr krrs krsc krse krsk krsr krss ksbc ksbi ksbr ksbs kscb ksce ksci ksck kscr kscs ksec ksee ksei ksek kser ksib ksii ksik ksir ksis kskb kske kskk kskr ksks ksrb ksrr ksrs ksse kssi kssr ksss rbbb rbbr rbbs rbis rbss rcbc rccb rccc rccs rcic rcis rcsc rcsi rcss rebb rebe rebk rebs recc rece reci reck recr recs reeb reek rees reii reik reir reis reke reki reks rere reri rers rese resi ress rib- ribe ribs ricc rice rick rics riek rier ries riis rike riki rikk rire riri rirs risc rise risi risk riss rkss rrrr rsbi rscc rscs rsee rsis rsre s-ib s-ic s-ii sbbs sbcc sbcs sber sbic sbrk sbse sbsi scbi sccc scce sccs scec scee scer sci- scic scie scir scis sck- scr- scrc scre scri scrs scsc scsi scsr se-c se-e se-i se-k se-s sebe sebi sebs sec- secc sece seck secr secs seeb seec seek seer sees seie seii seik seir seis seke seki sekk serb serc sere seri serk serr sers sesc sese sesi sess sibc sibe sibi sibs sicc sice sici sick sics siec siek sier sies siik sike siki sikr siks sirc sire siri sirk sirr sirs sisc sise sisi sisk siss skee skei sker skes skic skie skik skir skis skss srbc srcc sreb srec sres srib sris ssbr sscc ssce ssci sscs ssec ssee sses ssis ssrc ssri ssrs sssb sssc sssi ssss