-er -ic bbb bbc bbe bbf bbi bbk bbr bbs bcb bcc bce bcf bci bck bcr bcs be- beb bec bee bef bei bek ber bes bfb bfc bfe bff bfi bfr bfs bi- bib bic bie bif bii bik bir bis bkb bkc bke bkf bkk bkr bks brb bre brf bri brk brr brs bsb bsc bse bsf bsi bsk bsr bss c-- cbb cbc cbe cbf cbi cbk cbr cbs ccb ccc cce ccf cci cck ccr ccs ce- ceb cec cee cef cei cek cer ces cfb cfc cfe cff cfi cfk cfr cfs ci- cib cic cie cif cii cik cir cis ckb ckc cki cks crb crc cre crf cri crk crr crs csb csc cse csf csi csk csr css ebb ebc ebe ebf ebi ebk ebr ebs ec- ecb ecc ece ecf eci eck ecr ecs eeb eec eee eef eek eer ees ef- efb efc efe eff efi efr efs eib eic eie eif eii eik eir eis ekb ekc eke ekf eki ekr eks erb erc ere erf eri erk err ers es- esb esc ese esf esi esk esr ess fbb fbc fbe fbf fbi fbk fbr fbs fcb fcc fce fcf fci fck fcr fcs feb fec fee fef fei fek fer fes ffc ffe fff ffi ffk ffr ffs fib fic fie fif fii fik fir fis fkb fkc fkf fki fkk frb frc fre frf fri frk frr frs fsb fsc fse fsf fsi fsk fsr fss i-f ibb ibc ibe ibf ibi ibk ibr ibs icb icc ice icf ici ick icr ics ie- iec iee ief iei iek ier ies ifb ifc ife iff ifi ifr ifs iib iic iie iif iii iir iis ikb ikc ike ikf iki ikk ikr iks ir- irb irc ire irf iri irk irr irs is- isb isc ise isf isi isk isr iss kbb kbc kbe kbf kbi kbk kbr kbs kcb kcc kce kci kck kcr kcs ke- keb kec kee kef kei kek ker kes kfc kff kfi kfs kib kic kie kif kii kik kir kis kkb kkc kke kki kkk kkr kks krc krf kri krk krr krs ksb ksc kse ksf ksi ksk ksr kss rbb rbc rbe rbf rbi rbk rbr rbs rcb rcc rce rcf rci rcr rcs re- reb rec ree ref rei rek rer res rfb rfc rfe rff rfi rfk rfr rfs rib ric rie rif rii rik rir ris rkb rkc rke rkf rkk rks rrb rrc rrf rri rrk rrr rrs rsb rsc rse rsf rsi rsk rsr rss sbb sbc sbe sbf sbi sbk sbr sbs scb scc sce scf sci sck scr scs se- seb sec see sef sei sek ser ses sfb sfc sfe sff sfi sfk sfr sfs sib sic sie sif sii sik sir sis sk- skb skc ske skf ski skk skr sks sr- srb src sre srf sri srk srr srs ss- ssb ssc sse ssf ssi ssk ssr sss

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