a-a a-c a-t aaa aac aaf aak aao aar aas aat ac- aca acc acf ack aco acr acs act af- afa afc aff afk afo afr afs aft aka akc akk ako akr aks aoa aoc aof aok aoo aor aos aot ar- ara arc arf ark aro arr ars art as- asa asc asf ask aso asr ass ast at- ata atc atf ato atr ats att c-- caa cac caf cak cao car cas cat cca ccc ccf cck cco ccr ccs cct cfa cfc cff cfk cfo cfr cfs cft cka ckc cko cks ckt co- coa coc cof cok coo cor cos cot cra crc crf crk cro crr crs crt csa csc csf csk cso csr css cst cta ctc ctf ctk cto ctr cts ctt faa fac faf fak fao far fas fat fca fcc fcf fck fco fcr fcs fct ffa ffc fff ffk ffo ffr ffs fft fka fkc fkf fkk fkt foa foc fof fok foo for fos fot fra frc frf frk fro frr frs frt fsa fsc fsf fsk fso fsr fss fst fta ftc ftf ftk fto ftr fts ftt k-t ka- kaa kac kaf kak kao kar kas kat kca kcc kck kcr kcs kct kfa kfc kff kfo kfs kkc kkk kkr kks kkt koa koc kof kok koo kor kos kot kra krc krf krk kro krr krs krt ksa ksc ksf ksk kso ksr kss kst kta ktc ktf ktk kto ktr kts ktt oaa oac oaf oak oao oar oas oat oc- oca occ ocf ock oco ocr ocs oct of- ofa ofc off ofo ofr ofs oft oka okc okk oko okr oks oo- ooa ooc oof ook ooo oor oos oot or- ora orc orf ork oro orr ors ort os- osa osc osf osk oso osr oss ost ot- ota otc otf otk oto otr ots ott ra- raa rac raf rak rao rar ras rat rca rcc rcf rco rcr rcs rct rfa rfc rff rfk rfo rfr rfs rft rkc rkf rkk rko rks rkt roa roc rof rok roo ror ros rot rra rrc rrf rrk rrr rrs rrt rsa rsc rsf rsk rso rsr rss rst rta rtc rtf rtk rto rtr rts rtt saa sac saf sak sao sar sas sat sca scc scf sck sco scr scs sct sfa sfc sff sfk sfo sfr sfs sft sk- ska skc skf skk sko skr sks skt soa soc sof sok soo sor sos sot sr- sra src srf srk sro srr srs srt ss- ssa ssc ssf ssk sso ssr sss sst sta stc stf stk sto str sts stt taa tac taf tak tao tar tas tat tca tcc tcf tck tco tcr tcs tct tfa tfc tff tfk tfo tfr tfs tft tka tkc tkk tko tkr tks tkt to- toa toc tof tok too tor tos tot tra trc trf trk tro trr trs trt tsa tsc tsf tsk tso tsr tss tst tta ttc ttf ttk tto ttr tts ttt