-er a-a a-b a-c aaa aab aac aae aak aar aas ab- aba abb abc abe abk abr abs ac- aca acb acc ace ack acr acs aea aeb aec aee aek aer aes aka akb akc ake akk akr aks ar- ara arb arc are ark arr ars as- asa asb asc ase ask asr ass baa bab bac bae bak bar bas bba bbb bbc bbe bbk bbr bbs bca bcb bcc bce bck bcr bcs be- bea beb bec bee bek ber bes bka bkb bkc bke bkk bkr bks bra brb bre brk brr brs bsa bsb bsc bse bsk bsr bss c-- caa cab cac cae cak car cas cba cbb cbc cbe cbk cbr cbs cca ccb ccc cce cck ccr ccs ce- cea ceb cec cee cek cer ces cka ckb ckc cks cra crb crc cre crk crr crs csa csb csc cse csk csr css eaa eab eac eae eak ear eas eba ebb ebc ebe ebk ebr ebs ec- eca ecb ecc ece eck ecr ecs eea eeb eec eee eek eer ees eka ekb ekc eke ekr eks era erb erc ere erk err ers es- esa esb esc ese esk esr ess ka- kaa kab kac kae kak kar kas kba kbb kbc kbe kbk kbr kbs kca kcb kcc kce kck kcr kcs ke- kea keb kec kee kek ker kes kkb kkc kke kkk kkr kks kra krc krk krr krs ksa ksb ksc kse ksk ksr kss ra- raa rab rac rae rak rar ras rba rbb rbc rbe rbk rbr rbs rca rcb rcc rce rcr rcs re- rea reb rec ree rek rer res rkb rkc rke rkk rks rra rrb rrc rrk rrr rrs rsa rsb rsc rse rsk rsr rss saa sab sac sae sak sar sas sba sbb sbc sbe sbk sbr sbs sca scb scc sce sck scr scs se- sea seb sec see sek ser ses sk- ska skb skc ske skk skr sks sr- sra srb src sre srk srr srs ss- ssa ssb ssc sse ssk ssr sss

-ase a-ak a-be aaaa aaab aaac aaae aaar aaas aaba aabb aabc aaca aacb aacc aace aack aacr aacs aaea aaec aaes aaka aake aara aarc aare aars aasa aasc aase aass abaa abab abac abae abak abar abas abb- abba abbb abbe abbr abbs abca abcb abcc abcr abcs abec abee aber abes abra abrc abrs abs- absa abse abss acaa acab acac acae acar acas acba acca accc acce accs ace- acea acec acek acer aces acke acks acr- acra acrc acre acrr acrs acsa acsc acse acss aeac aeas aebs aecb aeer aeka aer- aera aerc aers aesc aess akaa akae akar akas akca akee aker akes akka akr- akra akre aksa arab arac arae arak arar aras arba arbe arbs arc- arca arce arcs area arec aree arek ares arka arke arks arr- arra arrc arre arrk arrr arrs ars- arsa arsc arse arsk asaa asab asac asae asak asar asas asba asc- asca ascb ascc asce ascr asea asec asee asek aser ases aska aske askr asks asra asrc asrs assa assc asse assk assr asss baaa baak baar baas baba babb babe babr babs bac- baca bacc bace back bacs baek baer baes bak- baka bake bakr baks bar- bara barb barc bare bark barr bars basa basc base bask bass bbas bbbb bbbs bbeb bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcec bcer bces bcra bcrs bcsa bcsc bcss beak bear beas beba bebb bebe beca beck becs beeb beek beer bees beka beke beks bera berc bere berk berr bers bes- besa bese besk bess brab brac brae brak bras brca brcb brce brea breb brec bree brek brer bres brka brkb brrr brrs brsb brsr bsaa bsac bsas bscs bsea bseb bsec bsee bser bses bsra bssc bsse caaa caab caac caas caba cabe cabs cac- caca cacc cace cack cacr caec caer caes caka cake cara carb carc care cark carr cars casa casb casc case cask casr cass cbac cbar cbbc cbbs cbca cbcc cbce cbcr cbcs cbea cbec cbee cber cbka cbkr cbre cbsa cbsc cbse ccaa ccab ccac ccar ccas ccba ccbc ccca cccb cccc cccs ccee ccra ccrc ccre ccrs ccsa ccss ceac cear ceas ceba cebs cec- ceca cece cecs ceeb ceec cees ceke cer- cera cerc cere cers cesa cesc cese cesr cess ckac ckbc ckbe ckck ckcs cker ckrc cksa cksb crab crac crar cras crbc crca crcc crce crcr cre- crea creb crec cree cres crkc crsa crss csaa csab csac csak csar csas cscb cscc csce cscr cscs csea csec csee cser cska csks csra csrc csrs cssa csse cssr eaba eaca eacc eaec eara earb eare ears easa ease ebac ebba ebbc ebbr ebbs ebcc eber ebes ebsa ecaa ecac ecar ecbc ecbe ecca eccb eccc ecce eces ecka ecks ecra ecrc ecrr ecsa ecsc ecse ecss eeca eecs eeea eeee eees eeka eeke eeks eera eerc eers eese eesk eka- ekab ekeb ekek eker ekes ekka eras erba erbb erbe erca ercc erce ereb erec erer eres erke erks erra errc erre errs ersa erse esab esac esar esas esba esbs esca escb esce escr escs esea esee esek eser eses eska eske esks esra essa esse kaaa kaab kaak kaar kaas kaba kabb kabc kabe kabr kacb kacc kace kacs kaer kaes kaka kakc kake kakk kaks kara karb kare kark karr kars kas- kasa kasb kasc kase kask kasr kass kbaa kbab kbac kbae kbak kbar kbas kbba kbbb kbbc kbbe kbbk kbbr kbbs kbca kbcb kbce kbck kbcr kbcs kbeb kbec kbee kbek kber kbes kbkb kbkk kbkr kbra kbrb kbrc kbre kbrk kbsa kbsb kbsk kbsr kbss kcaa kcab kcac kcar kcas kcba kcbc kcbk kcbr kcbs kcca kccb kccc kcck kccr kcea kceb kcec kcee kckc kckk kckr kcrc kcrr kcrs kcsa kcsb kcsc kcse kcsr kcss kea- keak kear