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my @array_one = (2, 1, 3, 5);
my @array_two = (2, 3, 1, 0);
...
        $same_pos, $same_pos==1 ? "":"s",
        $diff_pos, $diff_pos==1 ? "":"s";

element '1' in different position
element '2' in same position
element '3' in different position
=> 1 element in same position, 2 elements in different position

  3, 1, 3, 5
  3, 3, 1, 0