a-a a-b a-c a-t aaa aab aac aak aam aao aas aat ab- aba abb abc abk abm abo abs abt ac- aca acb acc ack acm aco acs act aka akb akc akk akm ako aks ama amb amc amk amm amo ams amt aoa aob aoc aok aom aoo aos aot as- asa asb asc ask asm aso ass ast at- ata atb atc atm ato ats att baa bab bac bak bam bao bas bat bba bbb bbc bbk bbm bbo bbs bbt bca bcb bcc bck bcm bco bcs bct bka bkb bkc bkk bkm bko bks bkt bma bmb bmc bmk bmm bmo bms bmt boa bob boc bok bom boo bos bot bsa bsb bsc bsk bsm bso bss bst bta btb btc btk btm bto bts btt c-- caa cab cac cak cam cao cas cat cba cbb cbc cbk cbm cbo cbs cbt cca ccb ccc cck ccm cco ccs cct cka ckb ckc ckm cko cks ckt cma cmb cmc cmk cmm cmo cms cmt co- coa cob coc cok com coo cos cot csa csb csc csk csm cso css cst cta ctb ctc ctk ctm cto cts ctt k-t ka- kaa kab kac kak kam kao kas kat kba kbb kbc kbk kbm kbo kbs kca kcb kcc kck kcm kcs kct kkb kkc kkk kkm kks kkt kma kmb kmc kmk kmm kmo kms kmt koa kob koc kok kom koo kos kot ksa ksb ksc ksk ksm kso kss kst kta ktb ktc ktk ktm kto kts ktt m-o maa mab mac mak mam mao mas mat mba mbb mbc mbk mbm mbo mbs mbt mc- mca mcb mcc mck mcm mco mcs mct mka mkb mkc mkk mkm mko mks mkt mma mmb mmc mmk mmm mmo mms mmt moa mob moc mok mom moo mos mot msa msb msc msk msm mso mss mst mta mtb mtc mtk mtm mto mts mtt oaa oab oac oak oam oao oas oat ob- oba obb obc obk obm obo obs obt oc- oca ocb occ ock ocm oco ocs oct oka okb okc okk oko oks om- oma omb omc omm omo oms omt oo- ooa oob ooc ook oom ooo oos oot os- osa osb osc osk osm oso oss ost ot- ota otb otc otk otm oto ots ott saa sab sac sak sam sao sas sat sba sbb sbc sbk sbm sbo sbs sbt sca scb scc sck scm sco scs sct sk- ska skb skc skk skm sko sks skt sma smb smc smk smm smo sms smt soa sob soc sok som soo sos sot ss- ssa ssb ssc ssk ssm sso sss sst sta stb stc stk stm sto sts stt taa tab tac tak tam tao tas tat tba tbb tbc tbk tbm tbo tbs tbt tca tcb tcc tck tcm tco tcs tct tka tkb tkc tkk tkm tko tks tkt tma tmb tmc tmk tmm tmo tms tmt to- toa tob toc tok tom too tos tot tsa tsb tsc tsk tsm tso tss tst tta ttb ttc ttk ttm tto tts ttt

a-ak a-ok aaaa aaab aaac aaam aaas aaba aabb aabc aabm aabt aaca aacb aacc aack aacm aaco aacs aact aaka aama aamb aamc aamo aams aaoo aasa aasc aasm aass aast aata aatc aatk aatt abaa abab abac abak abam abas abat abb- abba abbb abbo abbs abbt abca abcb abcc abcs abct abma abmb abmc abms abmt aboa abob abok aboo abos abot abs- absa abss abta abts ac-t acaa acab acac acas acat acba acca accc accm acco accs acct acks acma acmc acms acoa acom acos acot acsa acsc acsm acss acst acta actc acto acts actt akaa akam akao akas akca akka akko akok akom akos akot aksa akst amaa amac amam amas amat amb- amba ambo ambs amca amcc amco amcs amka amm- amma ammo amob amoc amok amoo amos amot amsa amsc amso amss amst amta amtc amtk amto amts aoba aoca aocs aoks aoma aoss aotc asaa asab asac asak asam asao asas asat asba asbm asbo asc- asca ascb ascc asco asct aska asko asks askt asma asmm asms asmt asob asoc asok asom asos asot assa assc assk asso asss asst asta astb astc astm asto asts at-t ataa atab atac atak atas atat atbs atca atcc atck atco atcs atka atkt atm- atma atmo atms atob atoc atok atom atos atot atsb atsc atst atta atto atts baaa baak baam baas baat baba babb babm babo babs bac- baca bacc back baco bacs bact bak- baka bako baks bakt bama bamb bamc bamm bams baos basa basc bask baso bass bast bata batc bato bats batt bbas bbbb bbbs bbcm bcaa bcam bcas bcat bcbc bcbs bcca bccc bccm bccs bcma bcms bcos bcsa bcsc bcsm bcss bctc bcts bmaa bmoc bmtc bmts boab boac boak boas boat boba bobb bobo bobs boca bock bocm boco bocs boka boko boks boma bomb boms bomt boob booc book boom boos boot bosa bosc bosk bosm boso boss bost bota botb boto bots bott bsaa bsac bsam bsas bsat bscs bskt bsms bsmt bsos bssc bssm bsts btaa btcc btcs btob btss bttb c-bo caaa caab caac caam caas caat caba cabo cabs cac- caca cacc cack cacm caco caka cama camb camc camk camm camo cams camt caos casa casb casc cask casm caso cass cast cat- cata catb catc catm cato cats catt cbac cbat cbbc cbbs cbca cbcc cbcm cbcs cbct cbka cbkm cbko cbms cbot cbsa cbsc cbsm cbta cbtc ccaa ccab ccac ccam ccas ccat ccba ccbc ccca cccb cccc cccm cccs cckm ccma ccmb ccmc ccmm ccms ccob ccoc ccom ccsa ccss ccst cctb cctc cctt ckac ckat ckbc ckck ckcm ckco ckcs ckmo ckoa ckob ckoc ckom ckoo ckos ckot cksa cksb ckso ckst cktb ckts cmaa cmac cmas cmba cmbc cmbs cmcc cmcs cmmb cmmc cmms cmoc cmos