a-a a-b a-c a-t aaa aab aac aak aan aar aat ab- aba abb abc abk abn abr abt ac- aca acb acc ack acn acr act aka akb akc akk akn akr an- ana anb anc ank ann anr ant ar- ara arb arc ark arn arr art at- ata atb atc atn atr att baa bab bac bak ban bar bat bba bbb bbc bbk bbn bbr bbt bca bcb bcc bck bcn bcr bct bka bkb bkc bkk bkn bkr bkt bna bnb bnc bnk bnn bnr bnt bra brb brk brn brr brt bta btb btc btk btn btr btt c-- caa cab cac cak can car cat cba cbb cbc cbk cbn cbr cbt cca ccb ccc cck ccn ccr cct cka ckb ckc ckt cn- cna cnb cnc cnn cnr cnt cra crb crc crk crn crr crt cta ctb ctc ctk ctn ctr ctt k-t ka- kaa kab kac kak kan kar kat kba kbb kbc kbk kbn kbr kca kcb kcc kck kcn kcr kct kkb kkc kkk kkn kkr kkt kn- kna knc knk knn knr knt kra krc krk krn krr krt kta ktb ktc ktk ktn ktr ktt naa nab nac nak nan nar nat nba nbb nbc nbk nbn nbr nbt nca ncb ncc nck ncn ncr nct nka nkc nkk nkn nkr nkt nna nnb nnc nnk nnn nnt nra nrb nrc nrk nrn nrr nrt nta ntb ntc ntk ntn ntr ntt ra- raa rab rac rak ran rar rat rba rbb rbc rbk rbn rbr rbt rca rcb rcc rcn rcr rct rkb rkc rkk rkt rna rnb rnc rnn rnr rnt rra rrb rrc rrk rrn rrr rrt rta rtb rtc rtk rtn rtr rtt taa tab tac tak tan tar tat tba tbb tbc tbk tbn tbr tbt tca tcb tcc tck tcn tcr tct tka tkb tkc tkk tkr tkt tna tnb tnc tnk tnn tnr tnt tra trb trc trk trn trr trt tta ttb ttc ttk ttn ttr ttt

-ana a-ak aaaa aaab aaac aaan aaar aaba aabb aabc aabt aaca aacb aacc aack aacn aacr aact aaka aana aara aarc aart aata aatc aatk aatt abaa abab abac abak aban abar abat abb- abba abbb abbr abbt abca abcb abcc abcn abcr abct abra abrc abta ac-t acaa acab acac acan acar acat acba acca accc acct acr- acra acrc acrr acta actc actt akaa akan akar akca akka akna akr- akra ana- anaa anab anac anak anan anar anat anba anbb anca ancc anct ank- anka anna annb annt anrc ant- anta antr antt arab arac arak aran arar arat arba arc- arca arct arka arna arnk arnt arr- arra arrc arrk arrr arrt arta artc artr at-t ataa atab atac atak atan atar atat atca atcc atck atcr atka atkt atna atra atrc atrk atrn atta attn attr baaa baak baan baar baat baba babb babr bac- baca bacc back bacn bact bak- baka bakr bakt bana banc bank bann banr bant bar- bara barb barc bark barn barr bart bata batc batn batt bbbb bbrc bcaa bcar bcat bcbc bcca bccc bcra bctc bnrr bnta brab brac brak bran brat brca brcb brka brkb brna brrr brtc btaa btan btcc btrc btrt bttb caaa caab caac caan caat caba cac- caca cacc cack cacr caka cana canc cank cann cant cara carb carc cark carn carr cart cat- cata catb catc catt cbac cbar cbat cbbc cbca cbcc cbcn cbcr cbct cbka cbkn cbkr cbna cbrn cbrt cbta cbtc ccaa ccab ccac ccar ccat ccba ccbc ccbn ccca cccb cccc ccna ccnb ccnc ccnr ccra ccrc ccrt cctb cctc cctt ckac ckan ckat ckbc ckck cknb cknc cknt ckrc cktb cnaa cnac cnbc cnna cnrc cnrr cnrt cnta cntc cntk cntr crab crac cran crar crat crbc crca crcc crcr crkc crna crrt crtc ctab ctan ctba ctca ctrc ctrn ctta cttn kaaa kaab kaak kaan kaar kaat kaba kabb kabc kabr kacb kacc kact kaka kakc kakk kakn kakt kana kanb kann kant kara karb kark karn karr kart kat- kata katb katc katk katn katr katt kbaa kbab kbac kbak kbar kbat kbba kbbb kbbc kbbk kbbr kbbt kbca kbcb kbck kbcr kbct kbkb kbkk kbkr kbna kbnn kbnr kbra kbrb kbrc kbrk kbrn kbrt kbta kbtb kbtc kbtk kbtn kbtr kbtt kcaa kcab kcac kcar kcat kcba kcbc kcbk kcbr kcca kccb kccc kcck kccr kcct kckc kckk kckn kckr kcnb kcnr kcnt kcrc kcrn kcrr kcrt kcta kctb kctc kctn kkaa kkac kkan kkar kkat kkba kkbb kkbn kkbr kkbt kkcb kkck kkcn kkcr kkct kkkk kknb kknn kknt kkrb kkrc kkrk kkrn kkrr kkrt kktc kktk knaa knab knac knan knar knat knba knbb knbc knbn knbr knbt knca kncb knck kncn kncr knct knkk knkt knnb knnk knnr knrb knrk kntk kntn kntr krab krac krak kran krar krat krba krbb krbk krbr krbt krca krcb krcc krcn krka krkc krkk krkn krkr krna krnb krnk krnn krnt krrb krrc krrk krrn krrr krrt krta krtc krtk krtn krtr ktaa ktak ktan ktar ktat ktba ktbb ktbc ktbn ktbr ktbt ktcc ktck ktcr ktkb ktkc ktkk ktkn ktkr ktkt ktna ktnc ktnk ktnn ktnt ktrb ktrc ktrk ktrn ktrr ktrt kttc kttk kttn kttr kttt naaa naab naac naan naar naat naba nabc nabk naca nacc nack naka nan- nana nanb nann nant nara narc nark narn narr nart nata natc natt nbaa nbak nbar nbbc nbca nbcc ncaa ncac ncar ncat ncba ncbc ncca nccc nccn nccr ncct ncna ncnc ncra ncrc ncta nctc nctr nknt nktr nnnn nntn nrab nrca nrna nrrc nrta ntbc ntcc ntrc nttr raab raak raan raat raba rabb rabk rac- raca racc rack ract raka rakk rakt rana ranc rank rann rant rara rarb rark rata ratk ratt rbbb rbbr rcac rcbc rccb rccc rcnr rctc rnbr rnnt rrat rrna rrrr rtan rtca rtcc rtkn taa- taan taar taat taba tabb tabc taca