-er a-a a-b a-c aaa aab aac aae aaf aak aar aas ab- aba abb abc abe abf abk abr abs ac- aca acb acc ace acf ack acr acs aea aeb aec aee aef aek aer aes af- afa afb afc afe aff afk afr afs aka akb akc ake akk akr aks ar- ara arb arc are arf ark arr ars as- asa asb asc ase asf ask asr ass baa bab bac bae baf bak bar bas bba bbb bbc bbe bbf bbk bbr bbs bca bcb bcc bce bcf bck bcr bcs be- bea beb bec bee bef bek ber bes bfa bfb bfc bfe bff bfr bfs bka bkb bkc bke bkf bkk bkr bks bra brb bre brf brk brr brs bsa bsb bsc bse bsf bsk bsr bss c-- caa cab cac cae caf cak car cas cba cbb cbc cbe cbf cbk cbr cbs cca ccb ccc cce ccf cck ccr ccs ce- cea ceb cec cee cef cek cer ces cfa cfb cfc cfe cff cfk cfr cfs cka ckb ckc cks cra crb crc cre crf crk crr crs csa csb csc cse csf csk csr css eaa eab eac eae eaf eak ear eas eba ebb ebc ebe ebf ebk ebr ebs ec- eca ecb ecc ece ecf eck ecr ecs eea eeb eec eee eef eek eer ees ef- efa efb efc efe eff efr efs eka ekb ekc eke ekf ekr eks era erb erc ere erf erk err ers es- esa esb esc ese esf esk esr ess faa fab fac fae faf fak far fas fba fbb fbc fbe fbf fbk fbr fbs fca fcb fcc fce fcf fck fcr fcs fea feb fec fee fef fek fer fes ffa ffc ffe fff ffk ffr ffs fka fkb fkc fkf fkk fra frb frc fre frf frk frr frs fsa fsb fsc fse fsf fsk fsr fss ka- kaa kab kac kae kaf kak kar kas kba kbb kbc kbe kbf kbk kbr kbs kca kcb kcc kce kck kcr kcs ke- kea keb kec kee kef kek ker kes kfa kfc kff kfs kkb kkc kke kkk kkr kks kra krc krf krk krr krs ksa ksb ksc kse ksf ksk ksr kss ra- raa rab rac rae raf rak rar ras rba rbb rbc rbe rbf rbk rbr rbs rca rcb rcc rce rcf rcr rcs re- rea reb rec ree ref rek rer res rfa rfb rfc rfe rff rfk rfr rfs rkb rkc rke rkf rkk rks rra rrb rrc rrf rrk rrr rrs rsa rsb rsc rse rsf rsk rsr rss saa sab sac sae saf sak sar sas sba sbb sbc sbe sbf sbk sbr sbs sca scb scc sce scf sck scr scs se- sea seb sec see sef sek ser ses sfa sfb sfc sfe sff sfk sfr sfs sk- ska skb skc ske skf skk skr sks sr- sra srb src sre srf srk srr srs ss- ssa ssb ssc sse ssf ssk ssr sss

-ase a-ak a-be aaaa aaab aaac aaae aaaf aaar aaas aaba aabb aabc aaca aacb aacc aace aacf aack aacr aacs aaea aaec aaes aafa aafb aafc aaff aaka aake aara aarc aare aars aasa aasc aase aasf aass abaa abab abac abae abaf abak abar abas abb- abba abbb abbe abbr abbs abca abcb abcc abcf abcr abcs abec abee aber abes abff abra abrc abrs abs- absa abse absf abss acaa acab acac acae acar acas acba acca accc acce accf accs ace- acea acec acek acer aces acfc acfe acfs acke acks acr- acra acrc acre acrr acrs acsa acsc acse acss aeac aeaf aeas aebs aecb aeer aeka aer- aera aerc aers aesc aess afaa afak afar afbs afca afcb afcc afcs afee afek afer afes affa affc affs afka afkr afr- afra afrc afre afrs afsa afsb afsc akaa akae akar akas akca akee aker akes akka akr- akra akre aksa arab arac arae araf arak arar aras arba arbe arbs arc- arca arce arcs area arec aree aref arek ares arfa arfb arfc arff arfs arka arke arks arr- arra arrc arre arrk arrr arrs ars- arsa arsc arse arsk asaa asab asac asae asaf asak asar asas asba asc- asca ascb ascc asce ascr asea asec asee asek aser ases asfa aska aske askr asks asra asrc asrs assa assc asse assk assr asss baaa baaf baak baar baas baba babb babe babr babs bac- baca bacc bace back bacs baek baer baes bafc baff bak- baka bake bakr baks bar- bara barb barc bare barf bark barr bars basa basc base basf bask bass bbas bbbb bbbs bbeb bbfc bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcec bcer bces bcfc bcra bcrs bcsa bcsc bcss beaf beak bear beas beba bebb bebe beca beck becs beeb beef beek beer bees befa befe beff beka beke beks bera berc bere berk berr bers bes- besa bese besk bess bfas bfca bfcs bffs bfsr brab brac brae braf brak bras brca brcb brce brea breb brec bree bref brek brer bres brfc brka brkb brrr brrs brsb brsr bsaa bsac bsas bscs bsea bseb bsec bsee bser bses bsfa bsfc bsff bsfs bsra bssc bsse caaa caab caac caaf caas caba cabe cabf cabs cac- caca cacc cace cack cacr caec caer caes cafa cafb cafc cafe caff cafs caka cake cara carb carc care carf cark carr cars casa casb casc case cask casr cass cbac cbar cbbc cbbs cbca cbcc cbce cbcr cbcs cbea cbec cbee cbef cber cbfb cbfc cbka cbkr cbre cbsa cbsc cbse ccaa ccab ccac ccaf ccar ccas ccba ccbc ccca cccb cccc cccf cccs ccee ccfa ccfc ccff ccra ccrc ccre ccrf ccrs ccsa ccsf ccss ceac cear ceas ceba cebs cec- ceca cece cecs ceeb ceec cees cef- cefa cefc ceke cer- cera cerc cere cerf cers cesa cesc cese cesr cess cfaa cfab cfac