bbbb bbbs bbci bbeb bbfc bbrc bcbc bcbs bccc bcci bccs bcec bcer bces bcfc bcie bcis bcrs bcsc bcss bebb bebe bebi beci beck becs beeb beef beek beer bees befe beff beic beik beir beis beke beki beks berc bere beri berk berr bers bes- bese besk bess bfcs bffs bfsi bfsr bibb bibe bibi bibs bicc bice bici bick bics bieb bief bier bies biff bifi biis bike birb bire biri birk birr birs bis- bisc bise bisk biss brcb brce breb brec bree bref brei brek brer bres brfc bric brie brik bris brkb brrr brrs brsb brsr bsci bscs bseb bsec bsee bser bses bsfc bsff bsfs bsic bssc bsse cbbc cbbs cbcc cbce cbcr cbcs cbec cbee cbef cber cbfb cbfc cbir cbkr cbre cbsc cbse cbsi ccbc cccb cccc cccf ccci cccs ccee ccfc ccff ccfi ccic ccii ccir ccis ccrc ccre ccrf ccri ccrs ccsf ccsi ccss cebs cec- cece ceci cecs ceeb ceec cees cef- cefc ceke cer- cerc cere cerf ceri cers cesc cese cesi cesr cess cfbc cfbr cfbs cfcb cfcf cfcs cffb cffr cfrb cfre cfse cfsi cibc cibe cibi cicc cici cicr cics ciee cier cies cife ciff cifs ciii ciis cikr cirb circ cire ciri cirk cirr cirs cis- cisc cise cisk cisr ciss ckbc ckbe ckbi ckck ckcs cker ckfi ckfr ckrc cksb crbc crcc crce crcr cre- creb crec cree crei cres crfc crfs crib cric crie crif crik cris crkc crss csbf cscb cscc csce cscf csci cscr cscs csec csee cser csfc csfr csib csik csir csis csks csrc csrs csse cssr ebbc ebbr ebbs ebcc eber ebes ebfc ebic ebis ecbc ecbe eccb eccc ecce ecci ecef eces ecfc ecfr ecfs ecib ecis ecks ecrc ecrf ecri ecrr ecsc ecse ecss eecs eeee eees eefe eeke eeks eerc eers eese eesi eesk efbr efes effi effs efic efik efke efsi eick eics eiec eiei eier eies eifs eike eiki eiks eire eirs eise eisk eiss ekeb ekek eker ekes ekfc ekis ekki eksi erbb erbe ercc erce ereb erec erei erer eres erfc erfs eric erie erik eris erke erki erks errc erre errs erse ersi esbs escb esce esci escr escs esee esek eser eses esfs esie esik esis eske esks esri esse essi f--k fbis fbrs fcbs fccf fces fcic fcii fcsc febs fece feck feeb feek feer fees fefc fefe feff fefi feie feir feis feke ferb ferc fere ferk ferr fers fese fess ffcc ffee ffff ffii ffrr ffss fibe fibs ficc fice fick fics fiec fief fier fies fifc fife fiff fifi fiii fike fiki fire firk firs fisc fise fisi fisk fiss frbc frcc free frei fres frfc frib fric frie frik fris frsb frsc fscb fscc fsck fsec fsfi fssc fssf i-be ibcs ibec ibes ibfi ibie ibis ibrc ibri ibsf ibss icbc icbs iccb iccc iccf icci iccr iccs icec icee icef icer ices icfb icis icke icks icrc icre icrf icrr icrs icsb icsc icse icsi icsr icss iecc ieie iere ieri iers iesc iesi iesr ifbb ifer ifes ific ifis ifrb ifrf ifri ifsb ifsc iies iiie iiii iiis iirc iirs iisc iisi iisr ikee iker ikes ikki ikri irbe ircc ircs iree irer ires irfe iri- iric irie iris irki irks irrc irre irri irrs irse irsf isbe iscc isci iscr iscs iseb isec isee iser ises isfc isic isie isis iskf isri issc isse issf issi issr isss k-ci kbbb kbbc kbbe kbbf kbbi kbbk kbbr kbbs kbcb kbce kbci kbck kbcr kbcs kbeb kbec kbee kbef kbek kber kbes kbfb kbfc kbff kbfi kbfk kbfr kbfs kbib kbic kbie kbif kbik kbis kbkb kbkf kbkk kbkr kbrb kbrc kbre kbrf kbri kbrk kbsb kbsi kbsk kbsr kbss kcbc kcbf kcbi kcbk kcbr kcbs kccb kccc kcci kcck kccr kceb kcec kcee kcei kcfb kcfc kcfi kcic kcie kcif kcii kcir kcis kckc kckf kckk kckr kcrc kcri kcrr kcrs kcsb kcsc kcse kcsf kcsi kcsr kcss kebb kebc kebe kebi kebr keck kecr keef keek keer kees kefb kefc keff kefr kefs keib keif keii keik keir keis kekb kekc keke keki keks ker- kerb kerc kere kerf keri kerk kerr kers kesb kesc kesi kesk kesr kess kfbc kfbk kfcf kfcr kfcs kfeb kfer kffb kfff kffk kfir kfis kfkb kfrc kfre kfri kfrr kfrs kfse kfsi kfsk kfsr kibb kibc kibe kibi kibr kibs kicb kicc kice kick kicr kics kief kier kies kife kiff kifr kifs kiic kiii kiik kiis kikc kikf kiki kikk kikr kirb kirc kirf kiri kirk kirr kirs kisc kise kisf kisi kisk kisr kiss kkbb kkbe kkbi kkbr kkbs kkcb kkci kkck kkcr kkcs kkfi kkfr kkfs kkic kkik kkkk kkrb kkrc kkre kkrf kkrk kkrr kkrs kkse kksf kksi kksr kkss krbb krbe krbi krbk krbr krcb krcc krce krci krcs kreb krec kree kref krei krek kres krfc krfe krff krfs krib krik kris krkc krke krki krkk krkr krks krrb krrc krre krrf krri krrk krrr krrs krsc krse krsf krsk krsr krss ksbc ksbi ksbr ksbs kscb ksce ksci ksck kscr kscs ksec ksee ksei ksek kser ksfb ksfc ksfe ksfi ksfr ksib ksif ksii ksik ksir ksis kskb kske kskf kskk kskr ksks ksrb ksrf ksrr ksrs ksse kssi kssr ksss rbbb rbbr rbbs rbis rbss rcbc rccb rccc rccs rcfc rcic rcis rcsc rcsi rcss rebb rebe rebk rebs recc rece reci reck recr recs reeb reef reek rees refe reff refi refr refs reif reii reik reir reis reke reki reks rere reri rers rese resi ress rfef rffc rfic rib- ribe ribs ricc rice rick rics rief riek rier ries rife riff rifs riif riis rike riki rikk rire riri rirs risc rise risi risk riss rkkf rkss rrfc rrif rrrr rsbi rscc rscs rsee rsfc rsis rsre s-ib s-ic s-ii sbbs sbcc sbcs sbef sber sbfc sbic sbrk sbse sbsi scbi sccc scce sccs scec scee scer scfc scfe scfi sci-