a-a a-c a-t a-z aaa aac aao aat aay aaz ac- aca acc aco act acy acz aoa aoc aoo aot at- ata atc ato att atz ay- aya ayc ayo ayt ayz az- aza azo azt azy azz c-- caa cac cao cat cay caz cca ccc cco cct ccz co- coa coc coo cot coy coz cta ctc cto ctt cty ctz cya cyc cyo cyt cz- czc czo czt oaa oac oao oat oc- oca occ oco oct ocz oo- ooa ooc ooo oot ot- ota otc oto ott otz oya oyo oza ozo ozt ozz taa tac tao tat tay taz tca tcc tco tct to- toa toc too tot toy toz tta ttc tto ttt tty tya tyc tyo tyt tza yaa yac yao yat yay yaz yca ycc yco ycy yoc yoo yot yoy yta ytc yto ytt yyc yyt yyy yyz yzy zaa zac zao zat zay zaz zco zo- zoa zoc zoo zot zta zzt zzy zzz