a-a a-c a-t aaa aac aae aak aao aas aat ac- aca acc ace ack aco acs act aea aec aee aek aeo aes aet aka akc ake akk ako aks aoa aoc aoe aok aoo aos aot as- asa asc ase ask aso ass ast at- ata atc ate ato ats att c-- caa cac cae cak cao cas cat cca ccc cce cck cco ccs cct ce- cea cec cee cek ceo ces cet cka ckc cko cks ckt co- coa coc coe cok coo cos cot csa csc cse csk cso css cst cta ctc cte ctk cto cts ctt eaa eac eae eak eao eas eat ec- eca ecc ece eck eco ecs ect eea eec eee eek eeo ees eet eka ekc eke eko eks ekt eo- eoa eoc eoe eok eoo eos eot es- esa esc ese esk eso ess est eta etc ete etk eto ets ett k-t ka- kaa kac kae kak kao kas kat kca kcc kce kck kcs kct ke- kea kec kee kek keo kes ket kkc kke kkk kks kkt koa koc koe kok koo kos kot ksa ksc kse ksk kso kss kst kta ktc kte ktk kto kts ktt oaa oac oae oak oao oas oat oc- oca occ ock oco ocs oct oea oec oee oeo oes oet oka okc oke okk oko oks oo- ooa ooc ook ooo oos oot os- osa osc ose osk oso oss ost ot- ota otc ote otk oto ots ott saa sac sae sak sao sas sat sca scc sce sck sco scs sct se- sea sec see sek seo ses set sk- ska skc ske skk sko sks skt soa soc soe sok soo sos sot ss- ssa ssc sse ssk sso sss sst sta stc ste stk sto sts stt taa tac tae tak tao tas tat tca tcc tce tck tco tcs tct te- tea tec tee tek teo tes tet tka tkc tke tkk tko tks tkt to- toa toc toe tok too tos tot tsa tsc tse tsk tso tss tst tta ttc tte ttk tto tts ttt