a-a a-c a-t a-z aaa aac aan aao aat aaz ac- aca acc acn aco act acz an- ana anc ann ano ant anz aoa aoc aon aoo aot at- ata atc atn ato att atz az- aza azn azo azt azz c-- caa cac can cao cat caz cca ccc ccn cco cct ccz cn- cna cnc cnn cno cnt co- coa coc con coo cot coz cta ctc ctn cto ctt ctz cz- czc czo czt naa nac nan nao nat naz nca ncc ncn nco nct nna nnc nnn nno nnt nnz no- noa noc non noo not noz nta ntc ntn nto ntt ntz nzo nzz oaa oac oan oao oat oc- oca occ ocn oco oct ocz on- ona onc onn ono ont oo- ooa ooc oon ooo oot ot- ota otc otn oto ott otz oza ozo ozt ozz taa tac tan tao tat taz tca tcc tcn tco tct tna tnc tnn tno tnt tnz to- toa toc ton too tot toz tta ttc ttn tto ttt tza zaa zac zan zao zat zaz zco znc znn zno zo- zoa zoc zon zoo zot zta zzt zzz