a-a a-c a-t a-z aaa aac aaf aao aar aat aaz ac- aca acc acf aco acr act acz af- afa afc aff afo afr aft afz aoa aoc aof aoo aor aot ar- ara arc arf aro arr art arz at- ata atc atf ato atr att atz az- aza azf azo azt azz c-- caa cac caf cao car cat caz cca ccc ccf cco ccr cct ccz cfa cfc cff cfo cfr cft cfz co- coa coc cof coo cor cot coz cra crc crf cro crr crt crz cta ctc ctf cto ctr ctt ctz cz- czc czo czt faa fac faf fao far fat faz fca fcc fcf fco fcr fct fcz ffa ffc fff ffo ffr fft ffz foa foc fof foo for fot foz fra frc frf fro frr frt fta ftc ftf fto ftr ftt ftz oaa oac oaf oao oar oat oc- oca occ ocf oco ocr oct ocz of- ofa ofc off ofo ofr oft ofz oo- ooa ooc oof ooo oor oot or- ora orc orf oro orr ort orz ot- ota otc otf oto otr ott otz oza ozo ozt ozz ra- raa rac raf rao rar rat raz rca rcc rcf rco rcr rct rfa rfc rff rfo rfr rft rfz roa roc rof roo ror rot roz rra rrc rrf rrr rrt rta rtc rtf rto rtr rtt rtz rza rzo taa tac taf tao tar tat taz tca tcc tcf tco tcr tct tfa tfc tff tfo tfr tft to- toa toc tof too tor tot toz tra trc trf tro trr trt trz tta ttc ttf tto ttr ttt tza tzf zaa zac zaf zao zar zat zaz zco zfa zfc zfr zo- zoa zoc zof zoo zor zot zro zta ztr zzr zzt zzz