a-a a-b a-c aaa aab aac aad aak aan aar aas ab- aba abb abc abd abk abn abr abs ac- aca acb acc acd ack acn acr acs ad- ada adb adc add adk adn adr ads aka akb akc akd akk akn akr aks an- ana anb anc and ank ann anr ans ar- ara arb arc ard ark arn arr ars as- asa asb asc asd ask asn asr ass baa bab bac bad bak ban bar bas bba bbb bbc bbd bbk bbn bbr bbs bca bcb bcc bcd bck bcn bcr bcs bda bdb bdc bdd bdk bdr bds bka bkb bkc bkk bkn bkr bks bna bnb bnc bnd bnk bnn bnr bns bra brb brd brk brn brr brs bsa bsb bsc bsd bsk bsn bsr bss c-- caa cab cac cad cak can car cas cba cbb cbc cbd cbk cbn cbr cbs cca ccb ccc ccd cck ccn ccr ccs cda cdb cdc cdd cdk cdn cdr cds cka ckb ckc ckd cks cn- cna cnb cnc cnd cnn cnr cns cra crb crc crd crk crn crr crs csa csb csc csd csk csn csr css daa dab dac dad dak dan dar das dba dbb dbc dbd dbk dbn dbr dbs dca dcb dcc dcd dck dcn dcr dcs dda ddb ddc ddd ddk ddn ddr dds dka dkb dkc dkk dkr dks dna dnb dnc dnd dnk dnn dnr dns dra drb drc drd drk drn drr drs dsa dsb dsc dsd dsk dsn dsr dss ka- kaa kab kac kad kak kan kar kas kba kbb kbc kbd kbk kbn kbr kbs kca kcb kcc kcd kck kcn kcr kcs kda kdb kdc kdk kdr kds kkb kkc kkk kkn kkr kks kn- kna knc knd knk knn knr kra krc krd krk krn krr krs ksa ksb ksc ksd ksk ksn ksr kss naa nab nac nad nak nan nar nas nba nbb nbc nbd nbk nbn nbr nbs nca ncb ncc ncd nck ncn ncr ncs nda ndb ndc ndd ndk ndn ndr nds nka nkc nkk nkn nkr nks nna nnb nnc nnk nnn nns nra nrb nrc nrd nrk nrn nrr nrs nsa nsb nsc nsd nsk nsn nsr nss ra- raa rab rac rad rak ran rar ras rba rbb rbc rbd rbk rbn rbr rbs rca rcb rcc rcd rcn rcr rcs rda rdb rdc rdd rdn rdr rds rkb rkc rkk rks rna rnb rnc rnd rnn rnr rns rra rrb rrc rrd rrk rrn rrr rrs rsa rsb rsc rsd rsk rsn rsr rss saa sab sac sad sak san sar sas sba sbb sbc sbd sbk sbn sbr sbs sca scb scc scd sck scn scr scs sda sdb sdc sdd sdk sdn sdr sds sk- ska skb skc skd skk skr sks sna snb snc snd snk snn snr sns sr- sra srb src srd srk srn srr srs ss- ssa ssb ssc ssd ssk ssn ssr sss

-ana a-ak aaaa aaab aaac aaad aaan aaar aaas aaba aabb aabc aabd aaca aacb aacc aacd aack aacn aacr aacs aada aadc aads aaka aana aand aara aarc aard aars aasa aasc aasd aass abaa abab abac abad abak aban abar abas abb- abba abbb abbr abbs abca abcb abcc abcd abcn abcr abcs abda abra abrc abrs abs- absa absd abss acaa acab acac acad acan acar acas acba acca accc accd accs acda acdb acdc acds ackd acks acr- acra acrc acrr acrs acsa acsc acsd acss adaa adab adac adad adak adan adar adas adba adbc adcc adcs adda addc addd addn addr adds adna adns adra adrs adsa adsr adss akaa akan akar akas akca akdn akka akna akr- akra aksa ana- anaa anab anac anad anak anan anar anas anba anbb anca ancc and- anda andr ands ank- anka anna annb anns anrc ansa ansd arab arac arad arak aran arar aras arba arbs arc- arca arcs arda ardc ards arka arks arna arnd arnk arns arr- arra arrc arrk arrr arrs ars- arsa arsc arsd arsk asaa asab asac asad asak asan asar asas asba asc- asca ascb ascc ascr asda asds aska askr asks asnc asra asrc asrs assa assc assd assk assn assr asss baaa baad baak baan baar baas baba babb babr babs bac- baca bacc back bacn bacs bada badb badd badr bads bak- baka bakr baks bana banc band bank bann banr bans bar- bara barb barc bard bark barn barr bars basa basc bask bass bbad bbas bbbb bbbs bbdd bbrc bcaa bcar bcas bcbc bcbs bcca bccc bccs bcda bcds bcra bcrs bcsa bcsc bcsn bcss bd-r bdbc bddc bdna bdsd bnas bnrr bnss brab brac brad brak bran bras brca brcb brda brds brka brkb brna brns brrr brrs brsb brsr bsaa bsac bsas bsbd bscs bsnd bsns bsra bsrd bssc bssd c-cd caaa caab caac caan caas caba cabs cac- caca cacc cack cacr cada cadc cadd cadr cads caka cana canc cand cank cann cans cara carb carc card cark carn carr cars casa casb casc casd cask casr cass cbac cbar cbbc cbbs cbca cbcc cbcn cbcr cbcs cbdb cbdc cbdn cbds cbka cbkn cbkr cbna cbnd cbrd cbrn cbsa cbsc cbsn ccaa ccab ccac ccad ccar ccas ccba ccbc ccbn ccca cccb cccc cccs ccdc ccdn ccdr ccds ccna ccnb ccnc ccnr ccns ccra ccrc ccrs ccsa ccsd ccsn ccss cd-r cdaa cdac cdad cdba cdcs cdda cddb cddr cdna cdnb cdnc cdrs cdss ckac ckan ckbc ckck ckcs cknb cknc ckns ckrc ckrd cksa cksb cnaa cnac cnas cnbc cnda cndd cnna cnrc cnrr cnsa cnss crab crac cran crar cras crbc crca crcc crcr crda crdc crkc crna crns crsa crss csaa csab csac csak csar csas cscb cscc cscd cscr cscs csda csdb csdn csdr cska csks csra csrc csrd csrs cssa cssd cssr d-na daab daad daan daar daas daba dabb dabs daca dacs dada dads