https://blog.wongcw.com/2020/10/26/%e7%9c%be%e7%b1%8c%e5%a4%b1%e6%95%97%ef%bc%9amrg%e6%9c%aa%e8%83%bd%e5%90%91%e6%94%af%e6%8c%81%e8%80%85%e4%ba%a4%e4%bb%98hal-9000%e5%be%a9%e5%88%bb%e7%94%a2%e5%93%81/