https://blog.wongcw.com/2019/10/11/acme-cad-converter-2019-v8-9-8-1501-%e5%a4%9a%e8%aa%9e%e8%a8%80%e4%b8%ad%e6%96%87%e2%80%8b%e2%80%8b%e8%a8%bb%e5%86%8a%e7%89%88%e9%99%84%e8%a8%bb%e5%86%8a%e7%a2%bc/