https://younghwani.github.io/posts/%EC%95%84%EC%9D%B4%ED%85%9C37-ordinal-%EC%9D%B8%EB%8D%B1%EC%8B%B1-%EB%8C%80%EC%8B%A0-EnumMap%EC%9D%84-%EC%82%AC%EC%9A%A9%ED%95%98%EB%9D%BC/