a-a a-b a-c a-t aaa aab aac aak aan aas aat ab- aba abb abc abk abn abs abt ac- aca acb acc ack acn acs act aka akb akc akk akn aks an- ana anb anc ank ann ans ant as- asa asb asc ask asn ass ast at- ata atb atc atn ats att baa bab bac bak ban bas bat bba bbb bbc bbk bbn bbs bbt bca bcb bcc bck bcn bcs bct bka bkb bkc bkk bkn bks bkt bna bnb bnc bnk bnn bns bnt bsa bsb bsc bsk bsn bss bst bta btb btc btk btn bts btt c-- caa cab cac cak can cas cat cba cbb cbc cbk cbn cbs cbt cca ccb ccc cck ccn ccs cct cka ckb ckc cks ckt cn- cna cnb cnc cnn cns cnt csa csb csc csk csn css cst cta ctb ctc ctk ctn cts ctt k-t ka- kaa kab kac kak kan kas kat kba kbb kbc kbk kbn kbs kca kcb kcc kck kcn kcs kct kkb kkc kkk kkn kks kkt kn- kna knc knk knn knt ksa ksb ksc ksk ksn kss kst kta ktb ktc ktk ktn kts ktt naa nab nac nak nan nas nat nba nbb nbc nbk nbn nbs nbt nca ncb ncc nck ncn ncs nct nka nkc nkk nkn nks nkt nna nnb nnc nnk nnn nns nnt nsa nsb nsc nsk nsn nss nst nta ntb ntc ntk ntn nts ntt saa sab sac sak san sas sat sba sbb sbc sbk sbn sbs sbt sca scb scc sck scn scs sct sk- ska skb skc skk sks skt sna snb snc snk snn sns snt ss- ssa ssb ssc ssk ssn sss sst sta stb stc stk stn sts stt taa tab tac tak tan tas tat tba tbb tbc tbk tbn tbs tbt tca tcb tcc tck tcn tcs tct tka tkb tkc tkk tks tkt tna tnb tnc tnk tnn tns tnt tsa tsb tsc tsk tsn tss tst tta ttb ttc ttk ttn tts ttt

-ana a-ak aaaa aaab aaac aaan aaas aaba aabb aabc aabt aaca aacb aacc aack aacn aacs aact aaka aana aasa aasc aass aast aata aatc aatk aatt abaa abab abac abak aban abas abat abb- abba abbb abbs abbt abca abcb abcc abcn abcs abct abs- absa abss abta abts ac-t acaa acab acac acan acas acat acba acca accc accs acct acks acsa acsc acss acst acta actc acts actt akaa akan akas akca akka akna aksa akst ana- anaa anab anac anak anan anas anat anba anbb anca ancc anct ank- anka anna annb anns annt ansa ant- anta ants antt asaa asab asac asak asan asas asat asba asc- asca ascb ascc asct aska asks askt asnc assa assc assk assn asss asst asta astb astc asts at-t ataa atab atac atak atan atas atat atbs atca atcc atck atcs atka atkt atna atns atsb atsc atst atta attn atts baaa baak baan baas baat baba babb babs bac- baca bacc back bacn bacs bact bak- baka baks bakt bana banc bank bann bans bant basa basc bask bass bast bata batc batn bats batt bbas bbbb bbbs bcaa bcas bcat bcbc bcbs bcca bccc bccs bcsa bcsc bcsn bcss bctc bcts bnas bnss bnta bsaa bsac bsas bsat bscs bskt bsns bssc bsts btaa btan btcc btcs btss bttb caaa caab caac caan caas caat caba cabs cac- caca cacc cack caka cana canc cank cann cans cant casa casb casc cask cass cast cat- cata catb catc cats catt cbac cbat cbbc cbbs cbca cbcc cbcn cbcs cbct cbka cbkn cbna cbsa cbsc cbsn cbta cbtc ccaa ccab ccac ccas ccat ccba ccbc ccbn ccca cccb cccc cccs ccna ccnb ccnc ccns ccsa ccsn ccss ccst cctb cctc cctt ckac ckan ckat ckbc ckck ckcs cknb cknc ckns cknt cksa cksb ckst cktb ckts cnaa cnac cnas cnbc cnna cnsa cnss cnta cntc cntk csaa csab csac csak csas csat cscb cscc cscs cska csks cssa csta cstc csts ctab ctan ctba ctbs ctca ctns ctsa ctsc ctsn ctss ctta cttn ctts kaaa kaab kaak kaan kaas kaat kaba kabb kabc kacb kacc kacs kact kaka kakc kakk kakn kaks kakt kana kanb kann kans kant kas- kasa kasb kasc kask kasn kass kast kat- kata katb katc katk katn kats katt kbaa kbab kbac kbak kbas kbat kbba kbbb kbbc kbbk kbbs kbbt kbca kbcb kbck kbcs kbct kbkb kbkk kbna kbnn kbsa kbsb kbsk kbsn kbss kbst kbta kbtb kbtc kbtk kbtn kbts kbtt kcaa kcab kcac kcas kcat kcba kcbc kcbk kcbs kcca kccb kccc kcck kcct kckc kckk kckn kcnb kcns kcnt kcsa kcsb kcsc kcsn kcss kcst kcta kctb kctc kctn kkaa kkac kkan kkat kkba kkbb kkbn kkbs kkbt kkcb kkck kkcn kkcs kkct kkkk kknb kknn kkns kknt kksa kksn kkss kkst kktc kktk kkts knaa knab knac knan knas knat knba knbb knbc knbn knbt knca kncb knck kncn knct knkk knkt knnb knnk knns knsa knsb knsc knsk knsn knss knst kntk kntn knts ksab ksac ksak ksan ksas ksat ksba ksbc ksbn ksbs ksca kscb ksck kscn kscs kska kskb kskk kskn ksks ksna ksnb ksnc ksnk ksnn ksns ksnt kssa kssn ksss ksst ksta kstb kstc kstk kstn ksts kstt ktaa ktak ktan ktas ktat ktba ktbb ktbc ktbn ktbt ktcc ktck ktcs ktkb ktkc ktkk ktkn ktks ktkt ktna ktnc ktnk ktnn ktns ktnt ktsa ktsc ktsn ktst kttc kttk kttn ktts kttt naaa naab naac naan naas naat naba nabc nabk nabs naca nacc nack nacs naka naks nan- nana nanb nann nans nant nas- nasa nasb nasc nask nass nast nata natc nats natt nbaa nbak nbas nbbc nbca nbcc nbcs ncaa ncac ncat ncba ncbc ncbs ncca nccc nccn nccs ncct ncna ncnc ncsa ncsc ncss ncst ncta nctc nknt nnnn nnsa nnss nntn nsaa nsac nsca nscc nscs nskk nsna nssa