a-a a-c a-t aaa aac aak aao aas aat ac- aca acc ack aco acs act aka akc akk ako aks aoa aoc aok aoo aos aot as- asa asc ask aso ass ast at- ata atc ato ats att c-- caa cac cak cao cas cat cca ccc cck cco ccs cct cka ckc cko cks ckt co- coa coc cok coo cos cot csa csc csk cso css cst cta ctc ctk cto cts ctt k-t ka- kaa kac kak kao kas kat kca kcc kck kcs kct kkc kkk kks kkt koa koc kok koo kos kot ksa ksc ksk kso kss kst kta ktc ktk kto kts ktt oaa oac oak oao oas oat oc- oca occ ock oco ocs oct oka okc okk oko oks oo- ooa ooc ook ooo oos oot os- osa osc osk oso oss ost ot- ota otc otk oto ots ott saa sac sak sao sas sat sca scc sck sco scs sct sk- ska skc skk sko sks skt soa soc sok soo sos sot ss- ssa ssc ssk sso sss sst sta stc stk sto sts stt taa tac tak tao tas tat tca tcc tck tco tcs tct tka tkc tkk tko tks tkt to- toa toc tok too tos tot tsa tsc tsk tso tss tst tta ttc ttk tto tts ttt