https://blog.wongcw.com/2021/05/16/counterpoint%ef%bc%9a%e7%ab%b6%e7%88%ad%e5%8a%a0%e5%8a%87%e8%81%af%e7%99%bc%e7%a7%91%e8%88%87%e9%ab%98%e9%80%9a%e7%9a%84%e5%b7%ae%e8%b7%9d%e9%80%90%e6%bc%b8%e7%b8%ae%e5%b0%8f/