a-a a-c a-t aaa aac aaf aan aao aat ac- aca acc acf acn aco act af- afa afc aff afn afo aft an- ana anc anf ann ano ant aoa aoc aof aon aoo aot at- ata atc atf atn ato att c-- caa cac caf can cao cat cca ccc ccf ccn cco cct cfa cfc cff cfn cfo cft cn- cna cnc cnf cnn cno cnt co- coa coc cof con coo cot cta ctc ctf ctn cto ctt faa fac faf fan fao fat fca fcc fcf fcn fco fct ffa ffc fff ffn ffo fft fna fnc fnf fnn fnt foa foc fof fon foo fot fta ftc ftf ftn fto ftt naa nac naf nan nao nat nca ncc ncf ncn nco nct nfa nfc nff nfn nfo nft nna nnc nnf nnn nno nnt no- noa noc nof non noo not nta ntc ntf ntn nto ntt oaa oac oaf oan oao oat oc- oca occ ocf ocn oco oct of- ofa ofc off ofn ofo oft on- ona onc onf onn ono ont oo- ooa ooc oof oon ooo oot ot- ota otc otf otn oto ott taa tac taf tan tao tat tca tcc tcf tcn tco tct tfa tfc tff tfn tfo tft tna tnc tnf tnn tno tnt to- toa toc tof ton too tot tta ttc ttf ttn tto ttt