a-a a-b a-c a-t aaa aab aac aak aao aas aat ab- aba abb abc abk abo abs abt ac- aca acb acc ack aco acs act aka akb akc akk ako aks aoa aob aoc aok aoo aos aot as- asa asb asc ask aso ass ast at- ata atb atc ato ats att baa bab bac bak bao bas bat bba bbb bbc bbk bbo bbs bbt bca bcb bcc bck bco bcs bct bka bkb bkc bkk bko bks bkt boa bob boc bok boo bos bot bsa bsb bsc bsk bso bss bst bta btb btc btk bto bts btt c-- caa cab cac cak cao cas cat cba cbb cbc cbk cbo cbs cbt cca ccb ccc cck cco ccs cct cka ckb ckc cko cks ckt co- coa cob coc cok coo cos cot csa csb csc csk cso css cst cta ctb ctc ctk cto cts ctt k-t ka- kaa kab kac kak kao kas kat kba kbb kbc kbk kbo kbs kca kcb kcc kck kcs kct kkb kkc kkk kks kkt koa kob koc kok koo kos kot ksa ksb ksc ksk kso kss kst kta ktb ktc ktk kto kts ktt oaa oab oac oak oao oas oat ob- oba obb obc obk obo obs obt oc- oca ocb occ ock oco ocs oct oka okb okc okk oko oks oo- ooa oob ooc ook ooo oos oot os- osa osb osc osk oso oss ost ot- ota otb otc otk oto ots ott saa sab sac sak sao sas sat sba sbb sbc sbk sbo sbs sbt sca scb scc sck sco scs sct sk- ska skb skc skk sko sks skt soa sob soc sok soo sos sot ss- ssa ssb ssc ssk sso sss sst sta stb stc stk sto sts stt taa tab tac tak tao tas tat tba tbb tbc tbk tbo tbs tbt tca tcb tcc tck tco tcs tct tka tkb tkc tkk tko tks tkt to- toa tob toc tok too tos tot tsa tsb tsc tsk tso tss tst tta ttb ttc ttk tto tts ttt

a-ak a-ok aaaa aaab aaac aaas aaba aabb aabc aabt aaca aacb aacc aack aaco aacs aact aaka aaoo aasa aasc aass aast aata aatc aatk aatt abaa abab abac abak abas abat abb- abba abbb abbo abbs abbt abca abcb abcc abcs abct aboa abob abok aboo abos abot abs- absa abss abta abts ac-t acaa acab acac acas acat acba acca accc acco accs acct acks acoa acos acot acsa acsc acss acst acta actc acto acts actt akaa akao akas akca akka akko akok akos akot aksa akst aoba aoca aocs aoks aoss aotc asaa asab asac asak asao asas asat asba asbo asc- asca ascb ascc asco asct aska asko asks askt asob asoc asok asos asot assa assc assk asso asss asst asta astb astc asto asts at-t ataa atab atac atak atas atat atbs atca atcc atck atco atcs atka atkt atob atoc atok atos atot atsb atsc atst atta atto atts baaa baak baas baat baba babb babo babs bac- baca bacc back baco bacs bact bak- baka bako baks bakt baos basa basc bask baso bass bast bata batc bato bats batt bbas bbbb bbbs bcaa bcas bcat bcbc bcbs bcca bccc bccs bcos bcsa bcsc bcss bctc bcts boab boac boak boas boat boba bobb bobo bobs boca bock boco bocs boka boko boks boob booc book boos boot bosa bosc bosk boso boss bost bota botb boto bots bott bsaa bsac bsas bsat bscs bskt bsos bssc bsts btaa btcc btcs btob btss bttb c-bo caaa caab caac caas caat caba cabo cabs cac- caca cacc cack caco caka caos casa casb casc cask caso cass cast cat- cata catb catc cato cats catt cbac cbat cbbc cbbs cbca cbcc cbcs cbct cbka cbko cbot cbsa cbsc cbta cbtc ccaa ccab ccac ccas ccat ccba ccbc ccca cccb cccc cccs ccob ccoc ccsa ccss ccst cctb cctc cctt ckac ckat ckbc ckck ckco ckcs ckoa ckob ckoc ckoo ckos ckot cksa cksb ckso ckst cktb ckts coak coas coat coba cobb cobo cobs coca cock coco coct cok- coka coko coob cook coos coot cosa cosc coso coss cost cota cotb cotc coto cots cott csaa csab csac csak csao csas csat cscb cscc csco cscs cska csks csob csos csot cssa csta cstc csto csts ctab ctba ctbs ctca ctos ctot ctsa ctsc ctss ctta ctts k-os kaaa kaab kaak kaas kaat kaba kabb kabc kabo kacb kacc kaco kacs kact kaka kakc kakk kako kaks kakt kaoa kaoc kaok kaos kas- kasa kasb kasc kask kaso kass kast kat- kata katb katc katk kato kats katt kbaa kbab kbac kbak kbas kbat kbba kbbb kbbc kbbk kbbo kbbs kbbt kbca kbcb kbck kbco kbcs kbct kbkb kbkk kbko kboa kbob kboc kbok kboo kbos kbot kbsa kbsb kbsk kbso kbss kbst kbta kbtb kbtc kbtk kbto kbts kbtt kcaa kcab kcac kcas kcat kcba kcbc kcbk kcbs kcca kccb kccc kcck kcct kckc kckk kcko kcob kcos kcot kcsa kcsb kcsc kcss kcst kcta kctb kctc kcto kkaa kkac kkat kkba kkbb kkbo kkbs kkbt kkcb kkck kkco kkcs kkct kkkk kkoa kkob kkoo kkot kksa kkss kkst kktc kktk kkts koab koac koak koas koba kobb kobc kobk kobo kobs koca kocb kock kocs koct koka kokb kokc kokk koko koks koob kooc kook kooo koos koot kos- kosa kosb kosc koso koss kost kota kotb kotc kotk koto kots kott ksab ksac ksak ksas ksat ksba ksbc ksbs ksca kscb ksck ksco kscs kska kskb kskk ksko ksks ksob ksoc ksok ksoo ksos kssa ksso ksss ksst ksta kstb kstc kstk ksto ksts kstt ktaa ktak ktao ktas ktat ktba ktbb ktbc ktbt ktcc ktck ktco ktcs ktkb ktkc ktkk ktko ktks ktkt ktob ktoc ktok ktoo ktot ktsa ktsc ktso ktst kttc kttk ktto ktts kttt oaks oasc oass oast