my $hash_of_arrays = {
  array1 => [ 1, 2, 3 ],
  array2 => [ 'a', 'b', 'c' ]
};

foreach my $key ( %$hash_of_arrays ) {
  print "Key: $key\n";
  foreach my $array_element ( @$key ) {
    print "Array Element: $array_element\n";
  }
}