为了使事情更加复杂，或门和异或门的图像被交换（即或门的图像实际上意味着异或门）。
> To make things more complex, logic gates OR and XOR are pictured swapped (i.e. image of OR gate actually means apply XOR gate).
>
> — [April Fools Day Contest 2017: editorial - Codeforces](https://codeforces.com/blog/entry/51351)
by ud2_ @ 2019-07-19 14:00:54