a-a a-c a-t aaa aac aad aaf aan aao aat ac- aca acc acd acf acn aco act ad- ada adc add adf adn ado adt af- afa afc afd aff afn afo aft an- ana anc and anf ann ano ant aoa aoc aod aof aon aoo aot at- ata atc atd atf atn ato att c-- caa cac cad caf can cao cat cca ccc ccd ccf ccn cco cct cda cdc cdd cdf cdn cdo cdt cfa cfc cfd cff cfn cfo cft cn- cna cnc cnd cnf cnn cno cnt co- coa coc cod cof con coo cot cta ctc ctd ctf ctn cto ctt daa dac dad daf dan dao dat dca dcc dcd dcf dcn dco dct dda ddc ddd ddf ddn ddo ddt dfa dfc dfd dff dfn dfo dft dna dnc dnd dnf dnn dno dnt doa doc dod dof don doo dot dta dtc dtd dtf dtn dto dtt faa fac fad faf fan fao fat fca fcc fcd fcf fcn fco fct fda fdc fdd fdf fdn fdo fdt ffa ffc ffd fff ffn ffo fft fna fnc fnd fnf fnn fnt foa foc fof fon foo fot fta ftc ftd ftf ftn fto ftt naa nac nad naf nan nao nat nca ncc ncd ncf ncn nco nct nda ndc ndd ndf ndn ndo ndt nfa nfc nfd nff nfn nfo nft nna nnc nnf nnn nno nnt no- noa noc nod nof non noo not nta ntc ntd ntf ntn nto ntt oaa oac oad oaf oan oao oat oc- oca occ ocd ocf ocn oco oct oda odc odd odf odn odo odt of- ofa ofc ofd off ofn ofo oft on- ona onc ond onf onn ono ont oo- ooa ooc ood oof oon ooo oot ot- ota otc otd otf otn oto ott taa tac tad taf tan tao tat tca tcc tcd tcf tcn tco tct tda tdc tdd tdf tdn tdo tdt tfa tfc tfd tff tfn tfo tft tna tnc tnd tnf tnn tno tnt to- toa toc tod tof ton too tot tta ttc ttd ttf ttn tto ttt