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my %codon_table = (
    AAA => 'K',
...
    TTG => 'L',
    TTT => 'F',
);

my %codon_table = (
    TTT => 'F', TCT => 'S', TAT => 'Y', TGT => 'C',
...
    GTA => 'V', GCA => 'A', GAA => 'E', GGA => 'G',
    GTG => 'V', GCG => 'A', GAG => 'E', GGG => 'G',
);