a-a a-c a-t aaa aac aaf aak aao aar aat ac- aca acc acf ack aco acr act af- afa afc aff afk afo afr aft aka akc akk ako akr aoa aoc aof aok aoo aor aot ar- ara arc arf ark aro arr art at- ata atc atf ato atr att c-- caa cac caf cak cao car cat cca ccc ccf cck cco ccr cct cfa cfc cff cfk cfo cfr cft cka ckc cko ckt co- coa coc cof cok coo cor cot cra crc crf crk cro crr crt cta ctc ctf ctk cto ctr ctt faa fac faf fak fao far fat fca fcc fcf fck fco fcr fct ffa ffc fff ffk ffo ffr fft fka fkc fkf fkk fkt foa foc fof fok foo for fot fra frc frf frk fro frr frt fta ftc ftf ftk fto ftr ftt k-t ka- kaa kac kaf kak kao kar kat kca kcc kck kcr kct kfa kfc kff kfo kkc kkk kkr kkt koa koc kof kok koo kor kot kra krc krf krk kro krr krt kta ktc ktf ktk kto ktr ktt oaa oac oaf oak oao oar oat oc- oca occ ocf ock oco ocr oct of- ofa ofc off ofo ofr oft oka okc okk oko okr oo- ooa ooc oof ook ooo oor oot or- ora orc orf ork oro orr ort ot- ota otc otf otk oto otr ott ra- raa rac raf rak rao rar rat rca rcc rcf rco rcr rct rfa rfc rff rfk rfo rfr rft rkc rkf rkk rko rkt roa roc rof rok roo ror rot rra rrc rrf rrk rrr rrt rta rtc rtf rtk rto rtr rtt taa tac taf tak tao tar tat tca tcc tcf tck tco tcr tct tfa tfc tff tfk tfo tfr tft tka tkc tkk tko tkr tkt to- toa toc tof tok too tor tot tra trc trf trk tro trr trt tta ttc ttf ttk tto ttr ttt