a-a a-b a-c a-t aaa aab aac aak aam aar aas aat ab- aba abb abc abk abm abr abs abt ac- aca acb acc ack acm acr acs act aka akb akc akk akm akr aks ama amb amc amk amm amr ams amt ar- ara arb arc ark arm arr ars art as- asa asb asc ask asm asr ass ast at- ata atb atc atm atr ats att baa bab bac bak bam bar bas bat bba bbb bbc bbk bbm bbr bbs bbt bca bcb bcc bck bcm bcr bcs bct bka bkb bkc bkk bkm bkr bks bkt bma bmb bmc bmk bmm bmr bms bmt bra brb brk brm brr brs brt bsa bsb bsc bsk bsm bsr bss bst bta btb btc btk btm btr bts btt c-- caa cab cac cak cam car cas cat cba cbb cbc cbk cbm cbr cbs cbt cca ccb ccc cck ccm ccr ccs cct cka ckb ckc ckm cks ckt cma cmb cmc cmk cmm cmr cms cmt cra crb crc crk crm crr crs crt csa csb csc csk csm csr css cst cta ctb ctc ctk ctm ctr cts ctt k-t ka- kaa kab kac kak kam kar kas kat kba kbb kbc kbk kbm kbr kbs kca kcb kcc kck kcm kcr kcs kct kkb kkc kkk kkm kkr kks kkt kma kmb kmc kmk kmm kms kmt kra krc krk krr krs krt ksa ksb ksc ksk ksm ksr kss kst kta ktb ktc ktk ktm ktr kts ktt m-r maa mab mac mak mam mar mas mat mba mbb mbc mbk mbm mbr mbs mbt mc- mca mcb mcc mck mcm mcr mcs mct mka mkb mkc mkk mkm mkr mks mkt mma mmb mmc mmk mmm mmr mms mmt mra mrb mrc mrk mrm mrr mrs mrt msa msb msc msk msm msr mss mst mta mtb mtc mtk mtm mtr mts mtt ra- raa rab rac rak ram rar ras rat rba rbb rbc rbk rbm rbr rbs rbt rca rcb rcc rcm rcr rcs rct rkb rkc rkk rkm rks rkt rma rmb rmc rmm rmr rms rmt rra rrb rrc rrk rrm rrr rrs rrt rsa rsb rsc rsk rsm rsr rss rst rta rtb rtc rtk rtm rtr rts rtt saa sab sac sak sam sar sas sat sba sbb sbc sbk sbm sbr sbs sbt sca scb scc sck scm scr scs sct sk- ska skb skc skk skm skr sks skt sma smb smc smk smm smr sms smt sr- sra srb src srk srm srr srs srt ss- ssa ssb ssc ssk ssm ssr sss sst sta stb stc stk stm str sts stt taa tab tac tak tam tar tas tat tba tbb tbc tbk tbm tbr tbs tbt tca tcb tcc tck tcm tcr tcs tct tka tkb tkc tkk tkm tkr tks tkt tma tmb tmc tmk tmm tmr tms tmt tra trb trc trk trm trr trs trt tsa tsb tsc tsk tsm tsr tss tst tta ttb ttc ttk ttm ttr tts ttt

a-ak aaaa aaab aaac aaam aaar aaas aaba aabb aabc aabm aabt aaca aacb aacc aack aacm aacr aacs aact aaka aama aamb aamc aamr aams aara aarc aarm aars aart aasa aasc aasm aass aast aata aatc aatk aatt abaa abab abac abak abam abar abas abat abb- abba abbb abbr abbs abbt abca abcb abcc abcr abcs abct abma abmb abmc abms abmt abra abrc abrs abs- absa abss abta abts ac-t acaa acab acac acar acas acat acba acca accc accm accs acct acks acma acmc acms acr- acra acrc acrm acrr acrs acsa acsc acsm acss acst acta actc acts actt akaa akam akar akas akca akka akr- akra aksa akst amaa amac amam amar amas amat amb- amba ambr ambs amca amcc amcs amka amm- amma amra amrc amsa amsc amss amst amta amtc amtk amts arab arac arak aram arar aras arat arba arbs arc- arca arcm arcs arct arka arks arma armc armm arms armt arr- arra arrc arrk arrr arrs arrt ars- arsa arsc arsk arst arta artc artr arts asaa asab asac asak asam asar asas asat asba asbm asc- asca ascb ascc ascr asct aska askr asks askt asma asmm asmr asms asmt asra asrc asrm asrs assa assc assk assr asss asst asta astb astc astm astr asts at-t ataa atab atac atak atar atas atat atbs atca atcc atck atcr atcs atka atkt atm- atma atms atra atrc atrk atrm atsb atsc atst atta attr atts baaa baak baam baar baas baat baba babb babm babr babs bac- baca bacc back bacs bact bak- baka bakr baks bakt bama bamb bamc bamm bams bar- bara barb barc bark barm barr bars bart basa basc bask bass bast bata batc bats batt bbas bbbb bbbs bbcm bbrc bcaa bcam bcar bcas bcat bcbc bcbs bcca bccc bccm bccs bcma bcms bcra bcrs bcsa bcsc bcsm bcss bctc bcts bmaa bmtc bmts brab brac brak bram bras brat brca brcb brka brkb brmc brrm brrr brrs brsb brsr brst brtc bsaa bsac bsam bsas bsat bscs bskt bsms bsmt bsra bsrm bssc bssm bsts btaa btcc btcs btrc btrt btss bttb caaa caab caac caam caas caat caba cabs cac- caca cacc cack cacm cacr caka cama camb camc camk camm cams camt cara carb carc cark carm carr cars cart casa casb casc cask casm casr cass cast cat- cata catb catc catm cats catt cbac cbar cbat cbbc cbbs cbca cbcc cbcm cbcr cbcs cbct cbka cbkm cbkr cbms cbrm cbrt cbsa cbsc cbsm cbta cbtc ccaa ccab ccac ccam ccar ccas ccat ccba ccbc ccca cccb cccc cccm cccs cckm ccma ccmb ccmc ccmm ccms ccra ccrc ccrs ccrt ccsa ccss ccst cctb cctc cctt ckac ckat ckbc ckck ckcm ckcs ckrc ckrm cksa cksb ckst cktb ckts cmaa cmac cmas cmba cmbc cmbs cmcc cmcs cmmb cmmc cmms cmra cmrr