図4 https://hirakawatblog.com/%e7%89%a9%e7%90%86%e5%9f%ba%e7%a4%8e%e2%91%b0%e3%80%80%e5%9c%a7%e5%8a%9b%e3%80%80%ef%bd%9e%e3%81%8d%e3%81%a1%e3%82%93%e3%81%a8%e5%9b%b3%e7%a4%ba%e3%81%97%e3%81%a6%e8%a8%88%e7%ae%97%e3%82%92%e3%81%a7/%e5%9b%b3%ef%bc%94-2