a-a a-c a-t aaa aac aan aao aat ac- aca acc acn aco act an- ana anc ann ano ant aoa aoc aon aoo aot at- ata atc atn ato att c-- caa cac can cao cat cca ccc ccn cco cct cn- cna cnc cnn cno cnt co- coa coc con coo cot cta ctc ctn cto ctt naa nac nan nao nat nca ncc ncn nco nct nna nnc nnn nno nnt no- noa noc non noo not nta ntc ntn nto ntt oaa oac oan oao oat oc- oca occ ocn oco oct on- ona onc onn ono ont oo- ooa ooc oon ooo oot ot- ota otc otn oto ott taa tac tan tao tat tca tcc tcn tco tct tna tnc tnn tno tnt to- toa toc ton too tot tta ttc ttn tto ttt