my %cars = (
  1002 => {
    make_id => 10,
    model_id => 27,
    year => 2001,
    price => 24000,
  },
);
my %makes = {
  1 = "Chevrolet",
  10 = "Acura",
};
my %models = {
  12 = "Camaro",
  27 = "RSX",
};