https://blog.gongquiz.com/2021/03/31/%eb%8b%a4%ec%9d%8c-%ec%a4%91-%eb%b6%88%eb%8c%80%ec%88%98boolean-algebra%ec%9d%98-%ea%b4%80%ea%b3%84%ec%8b%9d%ec%9c%bc%eb%a1%9c-%ec%98%b3%ec%9d%80-%ea%b2%83%ec%9d%80-%ec%82%b0%ec%97%85%ec%95%88/