a-a a-b a-c aaa aab aac aad aae aaf aak aas ab- aba abb abc abd abe abf abk abs ac- aca acb acc acd ace acf ack acs ad- ada adb adc add ade adf adk ads aea aeb aec aed aee aef aek aes af- afa afb afc afd afe aff afk afs aka akb akc akd ake akk aks as- asa asb asc asd ase asf ask ass baa bab bac bad bae baf bak bas bba bbb bbc bbd bbe bbf bbk bbs bca bcb bcc bcd bce bcf bck bcs bda bdb bdc bdd bde bdf bdk bds be- bea beb bec bed bee bef bek bes bfa bfb bfc bfd bfe bff bfs bka bkb bkc bke bkf bkk bks bsa bsb bsc bsd bse bsf bsk bss c-- caa cab cac cad cae caf cak cas cba cbb cbc cbd cbe cbf cbk cbs cca ccb ccc ccd cce ccf cck ccs cda cdb cdc cdd cde cdf cdk cds ce- cea ceb cec ced cee cef cek ces cfa cfb cfc cfd cfe cff cfk cfs cka ckb ckc ckd cks csa csb csc csd cse csf csk css daa dab dac dad dae daf dak das dba dbb dbc dbd dbe dbf dbk dbs dca dcb dcc dcd dce dcf dck dcs dda ddb ddc ddd dde ddf ddk dds de- dea deb dec ded dee def dek des dfa dfb dfc dfd dfe dff dfk dfs dka dkb dkc dke dkk dks dsa dsb dsc dsd dse dsf dsk dss eaa eab eac ead eae eaf eak eas eba ebb ebc ebd ebe ebf ebk ebs ec- eca ecb ecc ecd ece ecf eck ecs ed- eda edb edc edd ede edf edk eds eea eeb eec eed eee eef eek ees ef- efa efb efc efd efe eff efs eka ekb ekc ekd eke ekf eks es- esa esb esc esd ese esf esk ess faa fab fac fad fae faf fak fas fba fbb fbc fbd fbe fbf fbk fbs fca fcb fcc fcd fce fcf fck fcs fda fdb fdc fdd fde fdf fdk fds fea feb fec fed fee fef fek fes ffa ffc ffd ffe fff ffk ffs fka fkb fkc fkf fkk fsa fsb fsc fsd fse fsf fsk fss ka- kaa kab kac kad kae kaf kak kas kba kbb kbc kbd kbe kbf kbk kbs kca kcb kcc kcd kce kck kcs kda kdb kdc kde kdf kdk kds ke- kea keb kec ked kee kef kek kes kfa kfc kfd kff kfs kkb kkc kke kkk kks ksa ksb ksc ksd kse ksf ksk kss saa sab sac sad sae saf sak sas sba sbb sbc sbd sbe sbf sbk sbs sca scb scc scd sce scf sck scs sda sdb sdc sdd sde sdf sdk sds se- sea seb sec sed see sef sek ses sfa sfb sfc sfd sfe sff sfk sfs sk- ska skb skc skd ske skf skk sks ss- ssa ssb ssc ssd sse ssf ssk sss

-ase a-ak a-be aaaa aaab aaac aaad aaae aaaf aaas aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aack aacs aada aadc aade aads aaea aaec aaes aafa aafb aafc aafd aaff aaka aake aasa aasc aasd aase aasf aass abaa abab abac abad abae abaf abak abas abb- abba abbb abbe abbs abca abcb abcc abcd abcf abcs abda abec abed abee abes abff abs- absa absd abse absf abss acaa acab acac acad acae acas acba acca accc accd acce accf accs acda acdb acdc acde acdf acds ace- acea acec aced acek aces acfc acfd acfe acfs ackd acke acks acsa acsc acsd acse acss adaa adab adac adad adae adak adas adba adbc adcc adcs adda addc addd adde adds adea adeb adee ades adfa adfc adfs adsa adss aeac aeaf aeas aebs aecb aede aeka aesc aesd aess afaa afad afak afbs afca afcb afcc afcs afdb afdc afee afek afes affa affc affs afka afsa afsb afsc akaa akae akas akca aked akee akes akka aksa asaa asab asac asad asae asaf asak asas asba asc- asca ascb ascc asce asda asde asdf asds asea asec asee asek ases asfa aska aske asks assa assc assd asse assk asss baaa baad baaf baak baas baba babb babe babs bac- baca bacc bace back bacs bada badb badd bade bads baed baek baes bafc baff bak- baka bake baks basa basc base basf bask bass bbad bbas bbbb bbbs bbdd bbeb bbfc bcaa bcas bcbc bcbs bcca bccc bccs bcda bcde bcds bcec bces bcfc bcsa bcsc bcss bdbc bddc bdes bdsd bead beaf beak beas beba bebb bebe beca beck becs beda bede beds beeb beed beef beek bees befa befe beff beka beke beks bes- besa bese besk bess bfas bfca bfcs bffs bsaa bsac bsas bsbd bscs bsea bseb bsec bsed bsee bses bsfa bsfc bsff bsfs bssc bssd bsse c-cd caaa caab caac caaf caas caba cabe cabf cabs cac- caca cacc cace cack cada cadc cadd cade cads caec caes cafa cafb cafc cafe caff cafs caka cake casa casb casc casd case cask cass cbac cbbc cbbs cbca cbcc cbce cbcs cbdb cbdc cbds cbea cbec cbee cbef cbfb cbfc cbka cbsa cbsc cbse ccaa ccab ccac ccad ccaf ccas ccba ccbc ccca cccb cccc cccf cccs ccdc ccdf ccds cced ccee ccfa ccfc ccfd ccff ccsa ccsd ccsf ccss cd-e cdaa cdac cdad cdba cdbf cdcs cdda cddb cdec cdef cdes cdfa cdfe cdfs cdss ceac cead ceas ceba cebs cec- ceca cece cecs ceda cedd cede ceeb ceec cees cef- cefa cefc ceke cesa cesc cese cess cfaa cfab cfac cfae cfbc cfbs cfca cfcb cfcf cfcs cfda cfds cffb cfsa cfse ckac ckbc ckbe ckck ckcs cksa cksb csaa csab csac csak csas csbf cscb cscc cscd csce cscf cscs csda csdb csea csec csee csfc cska csks cssa cssd csse daab daad