a-a a-c a-t aaa aac aad aan aao aat ac- aca acc acd acn aco act ad- ada adc add adn ado adt an- ana anc and ann ano ant aoa aoc aod aon aoo aot at- ata atc atd atn ato att c-- caa cac cad can cao cat cca ccc ccd ccn cco cct cda cdc cdd cdn cdo cdt cn- cna cnc cnd cnn cno cnt co- coa coc cod con coo cot cta ctc ctd ctn cto ctt daa dac dad dan dao dat dca dcc dcd dcn dco dct dda ddc ddd ddn ddo ddt dna dnc dnd dnn dno dnt doa doc dod don doo dot dta dtc dtd dtn dto dtt naa nac nad nan nao nat nca ncc ncd ncn nco nct nda ndc ndd ndn ndo ndt nna nnc nnn nno nnt no- noa noc nod non noo not nta ntc ntd ntn nto ntt oaa oac oad oan oao oat oc- oca occ ocd ocn oco oct oda odc odd odn odo odt on- ona onc ond onn ono ont oo- ooa ooc ood oon ooo oot ot- ota otc otd otn oto ott taa tac tad tan tao tat tca tcc tcd tcn tco tct tda tdc tdd tdn tdo tdt tna tnc tnd tnn tno tnt to- toa toc tod ton too tot tta ttc ttd ttn tto ttt