a-a a-c a-t aaa aac aak aao aar aas aat ac- aca acc ack aco acr acs act aka akc akk ako akr aks aoa aoc aok aoo aor aos aot ar- ara arc ark aro arr ars art as- asa asc ask aso asr ass ast at- ata atc ato atr ats att c-- caa cac cak cao car cas cat cca ccc cck cco ccr ccs cct cka ckc cko cks ckt co- coa coc cok coo cor cos cot cra crc crk cro crr crs crt csa csc csk cso csr css cst cta ctc ctk cto ctr cts ctt k-t ka- kaa kac kak kao kar kas kat kca kcc kck kcr kcs kct kkc kkk kkr kks kkt koa koc kok koo kor kos kot kra krc krk kro krr krs krt ksa ksc ksk kso ksr kss kst kta ktc ktk kto ktr kts ktt oaa oac oak oao oar oas oat oc- oca occ ock oco ocr ocs oct oka okc okk oko okr oks oo- ooa ooc ook ooo oor oos oot or- ora orc ork oro orr ors ort os- osa osc osk oso osr oss ost ot- ota otc otk oto otr ots ott ra- raa rac rak rao rar ras rat rca rcc rco rcr rcs rct rkc rkk rko rks rkt roa roc rok roo ror ros rot rra rrc rrk rrr rrs rrt rsa rsc rsk rso rsr rss rst rta rtc rtk rto rtr rts rtt saa sac sak sao sar sas sat sca scc sck sco scr scs sct sk- ska skc skk sko skr sks skt soa soc sok soo sor sos sot sr- sra src srk sro srr srs srt ss- ssa ssc ssk sso ssr sss sst sta stc stk sto str sts stt taa tac tak tao tar tas tat tca tcc tck tco tcr tcs tct tka tkc tkk tko tkr tks tkt to- toa toc tok too tor tos tot tra trc trk tro trr trs trt tsa tsc tsk tso tsr tss tst tta ttc ttk tto ttr tts ttt