a-a a-b a-c a-t aaa aab aac aak aar aas aat ab- aba abb abc abk abr abs abt ac- aca acb acc ack acr acs act aka akb akc akk akr aks ar- ara arb arc ark arr ars art as- asa asb asc ask asr ass ast at- ata atb atc atr ats att baa bab bac bak bar bas bat bba bbb bbc bbk bbr bbs bbt bca bcb bcc bck bcr bcs bct bka bkb bkc bkk bkr bks bkt bra brb brk brr brs brt bsa bsb bsc bsk bsr bss bst bta btb btc btk btr bts btt c-- caa cab cac cak car cas cat cba cbb cbc cbk cbr cbs cbt cca ccb ccc cck ccr ccs cct cka ckb ckc cks ckt cra crb crc crk crr crs crt csa csb csc csk csr css cst cta ctb ctc ctk ctr cts ctt k-t ka- kaa kab kac kak kar kas kat kba kbb kbc kbk kbr kbs kca kcb kcc kck kcr kcs kct kkb kkc kkk kkr kks kkt kra krc krk krr krs krt ksa ksb ksc ksk ksr kss kst kta ktb ktc ktk ktr kts ktt ra- raa rab rac rak rar ras rat rba rbb rbc rbk rbr rbs rbt rca rcb rcc rcr rcs rct rkb rkc rkk rks rkt rra rrb rrc rrk rrr rrs rrt rsa rsb rsc rsk rsr rss rst rta rtb rtc rtk rtr rts rtt saa sab sac sak sar sas sat sba sbb sbc sbk sbr sbs sbt sca scb scc sck scr scs sct sk- ska skb skc skk skr sks skt sr- sra srb src srk srr srs srt ss- ssa ssb ssc ssk ssr sss sst sta stb stc stk str sts stt taa tab tac tak tar tas tat tba tbb tbc tbk tbr tbs tbt tca tcb tcc tck tcr tcs tct tka tkb tkc tkk tkr tks tkt tra trb trc trk trr trs trt tsa tsb tsc tsk tsr tss tst tta ttb ttc ttk ttr tts ttt

a-ak aaaa aaab aaac aaar aaas aaba aabb aabc aabt aaca aacb aacc aack aacr aacs aact aaka aara aarc aars aart aasa aasc aass aast aata aatc aatk aatt abaa abab abac abak abar abas abat abb- abba abbb abbr abbs abbt abca abcb abcc abcr abcs abct abra abrc abrs abs- absa abss abta abts ac-t acaa acab acac acar acas acat acba acca accc accs acct acks acr- acra acrc acrr acrs acsa acsc acss acst acta actc acts actt akaa akar akas akca akka akr- akra aksa akst arab arac arak arar aras arat arba arbs arc- arca arcs arct arka arks arr- arra arrc arrk arrr arrs arrt ars- arsa arsc arsk arst arta artc artr arts asaa asab asac asak asar asas asat asba asc- asca ascb ascc ascr asct aska askr asks askt asra asrc asrs assa assc assk assr asss asst asta astb astc astr asts at-t ataa atab atac atak atar atas atat atbs atca atcc atck atcr atcs atka atkt atra atrc atrk atsb atsc atst atta attr atts baaa baak baar baas baat baba babb babr babs bac- baca bacc back bacs bact bak- baka bakr baks bakt bar- bara barb barc bark barr bars bart basa basc bask bass bast bata batc bats batt bbas bbbb bbbs bbrc bcaa bcar bcas bcat bcbc bcbs bcca bccc bccs bcra bcrs bcsa bcsc bcss bctc bcts brab brac brak bras brat brca brcb brka brkb brrr brrs brsb brsr brst brtc bsaa bsac bsas bsat bscs bskt bsra bssc bsts btaa btcc btcs btrc btrt btss bttb caaa caab caac caas caat caba cabs cac- caca cacc cack cacr caka cara carb carc cark carr cars cart casa casb casc cask casr cass cast cat- cata catb catc cats catt cbac cbar cbat cbbc cbbs cbca cbcc cbcr cbcs cbct cbka cbkr cbrt cbsa cbsc cbta cbtc ccaa ccab ccac ccar ccas ccat ccba ccbc ccca cccb cccc cccs ccra ccrc ccrs ccrt ccsa ccss ccst cctb cctc cctt ckac ckat ckbc ckck ckcs ckrc cksa cksb ckst cktb ckts crab crac crar cras crat crbc crca crcc crcr crkc crrt crsa crss crst crtc crts csaa csab csac csak csar csas csat cscb cscc cscr cscs cska csks csra csrc csrs cssa cssr csta cstc cstr csts ctab ctba ctbs ctca ctrc ctrs ctsa ctsc ctss ctta ctts kaaa kaab kaak kaar kaas kaat kaba kabb kabc kabr kacb kacc kacs kact kaka kakc kakk kaks kakt kara karb kark karr kars kart kas- kasa kasb kasc kask kasr kass kast kat- kata katb katc katk katr kats katt kbaa kbab kbac kbak kbar kbas kbat kbba kbbb kbbc kbbk kbbr kbbs kbbt kbca kbcb kbck kbcr kbcs kbct kbkb kbkk kbkr kbra kbrb kbrc kbrk kbrt kbsa kbsb kbsk kbsr kbss kbst kbta kbtb kbtc kbtk kbtr kbts kbtt kcaa kcab kcac kcar kcas kcat kcba kcbc kcbk kcbr kcbs kcca kccb kccc kcck kccr kcct kckc kckk kckr kcrc kcrr kcrs kcrt kcsa kcsb kcsc kcsr kcss kcst kcta kctb kctc kkaa kkac kkar kkat kkba kkbb kkbr kkbs kkbt kkcb kkck kkcr kkcs kkct kkkk kkrb kkrc kkrk kkrr kkrs kkrt kksa kksr kkss kkst kktc kktk kkts krab krac krak krar kras krat krba krbb krbk krbr krbt krca krcb krcc krcs krka krkc krkk krkr krks krrb krrc krrk krrr krrs krrt krsa krsc krsk krsr krss krst krta krtc krtk krtr krts ksab ksac ksak ksar ksas ksat ksba ksbc ksbr ksbs ksca kscb ksck kscr kscs kska kskb kskk kskr ksks ksra ksrb ksrr ksrs ksrt kssa kssr ksss ksst ksta kstb kstc kstk kstr ksts kstt ktaa ktak ktar ktas ktat ktba ktbb ktbc ktbr ktbt ktcc ktck ktcr ktcs ktkb ktkc ktkk ktkr ktks ktkt ktrb ktrc ktrk ktrr ktrs ktrt ktsa ktsc ktsr ktst kttc kttk kttr ktts kttt raab raak