a-a a-b a-c aaa aab aac aae aaf aak aas ab- aba abb abc abe abf abk abs ac- aca acb acc ace acf ack acs aea aeb aec aee aef aek aes af- afa afb afc afe aff afk afs aka akb akc ake akk aks as- asa asb asc ase asf ask ass baa bab bac bae baf bak bas bba bbb bbc bbe bbf bbk bbs bca bcb bcc bce bcf bck bcs be- bea beb bec bee bef bek bes bfa bfb bfc bfe bff bfs bka bkb bkc bke bkf bkk bks bsa bsb bsc bse bsf bsk bss c-- caa cab cac cae caf cak cas cba cbb cbc cbe cbf cbk cbs cca ccb ccc cce ccf cck ccs ce- cea ceb cec cee cef cek ces cfa cfb cfc cfe cff cfk cfs cka ckb ckc cks csa csb csc cse csf csk css eaa eab eac eae eaf eak eas eba ebb ebc ebe ebf ebk ebs ec- eca ecb ecc ece ecf eck ecs eea eeb eec eee eef eek ees ef- efa efb efc efe eff efs eka ekb ekc eke ekf eks es- esa esb esc ese esf esk ess faa fab fac fae faf fak fas fba fbb fbc fbe fbf fbk fbs fca fcb fcc fce fcf fck fcs fea feb fec fee fef fek fes ffa ffc ffe fff ffk ffs fka fkb fkc fkf fkk fsa fsb fsc fse fsf fsk fss ka- kaa kab kac kae kaf kak kas kba kbb kbc kbe kbf kbk kbs kca kcb kcc kce kck kcs ke- kea keb kec kee kef kek kes kfa kfc kff kfs kkb kkc kke kkk kks ksa ksb ksc kse ksf ksk kss saa sab sac sae saf sak sas sba sbb sbc sbe sbf sbk sbs sca scb scc sce scf sck scs se- sea seb sec see sef sek ses sfa sfb sfc sfe sff sfk sfs sk- ska skb skc ske skf skk sks ss- ssa ssb ssc sse ssf ssk sss

-ase a-ak a-be aaaa aaab aaac aaae aaaf aaas aaba aabb aabc aaca aacb aacc aace aacf aack aacs aaea aaec aaes aafa aafb aafc aaff aaka aake aasa aasc aase aasf aass abaa abab abac abae abaf abak abas abb- abba abbb abbe abbs abca abcb abcc abcf abcs abec abee abes abff abs- absa abse absf abss acaa acab acac acae acas acba acca accc acce accf accs ace- acea acec acek aces acfc acfe acfs acke acks acsa acsc acse acss aeac aeaf aeas aebs aecb aeka aesc aess afaa afak afbs afca afcb afcc afcs afee afek afes affa affc affs afka afsa afsb afsc akaa akae akas akca akee akes akka aksa asaa asab asac asae asaf asak asas asba asc- asca ascb ascc asce asea asec asee asek ases asfa aska aske asks assa assc asse assk asss baaa baaf baak baas baba babb babe babs bac- baca bacc bace back bacs baek baes bafc baff bak- baka bake baks basa basc base basf bask bass bbas bbbb bbbs bbeb bbfc bcaa bcas bcbc bcbs bcca bccc bccs bcec bces bcfc bcsa bcsc bcss beaf beak beas beba bebb bebe beca beck becs beeb beef beek bees befa befe beff beka beke beks bes- besa bese besk bess bfas bfca bfcs bffs bsaa bsac bsas bscs bsea bseb bsec bsee bses bsfa bsfc bsff bsfs bssc bsse caaa caab caac caaf caas caba cabe cabf cabs cac- caca cacc cace cack caec caes cafa cafb cafc cafe caff cafs caka cake casa casb casc case cask cass cbac cbbc cbbs cbca cbcc cbce cbcs cbea cbec cbee cbef cbfb cbfc cbka cbsa cbsc cbse ccaa ccab ccac ccaf ccas ccba ccbc ccca cccb cccc cccf cccs ccee ccfa ccfc ccff ccsa ccsf ccss ceac ceas ceba cebs cec- ceca cece cecs ceeb ceec cees cef- cefa cefc ceke cesa cesc cese cess cfaa cfab cfac cfae cfbc cfbs cfca cfcb cfcf cfcs cffb cfsa cfse ckac ckbc ckbe ckck ckcs cksa cksb csaa csab csac csak csas csbf cscb cscc csce cscf cscs csea csec csee csfc cska csks cssa csse eaaf eaba eaca eacc eaec eafb easa ease ebac ebba ebbc ebbs ebcc ebes ebfc ebsa ecaa ecac ecbc ecbe ecca eccb eccc ecce ecef eces ecfa ecfc ecfs ecka ecks ecsa ecsc ecse ecss eeca eecs eeea eeee eees eefa eefe eeka eeke eeks eese eesk efab efas efca efes effa effs efke efsa eka- ekab ekeb ekek ekes ekfc ekka esab esac esas esba esbs esca escb esce escs esea esee esek eses esfs eska eske esks essa esse f--k faaa faac faas faba fabe fabs faca facc face fack facs faeb faes fafa fafc fafe faff fake fasa fasc fase fass fcab fcas fcba fcbs fcca fccf fces fcsc feaf feak feas feba febs fece feck feeb feek fees fefc fefe feff feke fesa fese fess ffcc ffee ffff ffsa ffss fkab fsas fscb fscc fsck fsec fssa fssc fssf kaaa kaab kaaf kaak kaas kaba kabb kabc kabe kabf kacb kacc kace kacs kaes kafa kafc kafe kaff kafs kaka kakc kake kakk kaks kas- kasa kasb kasc kase kasf kask kass kbaa kbab kbac kbae kbak kbas kbba kbbb kbbc kbbe kbbf kbbk kbbs kbca kbcb kbce kbck kbcs kbeb kbec kbee kbef kbek kbes kbfb kbfc kbff kbfk kbfs kbkb kbkf kbkk kbsa kbsb kbsk kbss kcaa kcab kcac kcas kcba kcbc kcbf kcbk kcbs kcca kccb kccc kcck kcea kceb kcec kcee kcfa kcfb kcfc kckc kckf kckk kcsa kcsb kcsc kcse kcsf kcss kea- keak keas keba kebb kebc kebe keca keck keef keek kees kefa kefb kefc keff kefs keka kekb kekc keke keks kesa kesb kesc kesk kess kfab kfac kfbc kfbk kfcf kfcs kfeb kffa kffb kfff kffk kfka kfkb kfsa kfse kfsk kkaa kkac kkba kkbb kkbe kkbs kkcb kkck kkcs kkea kkfs kkkk kksa kkse