図3-2 https://hirakawatblog.com/%ef%bd%81%ef%bc%8d%ef%bd%94%e3%82%b0%e3%83%a9%e3%83%95%e3%80%80%ef%bd%9e%ef%bd%96%ef%bc%8d%ef%bd%94%e3%82%b0%e3%83%a9%e3%83%95%e3%82%84%ef%bd%98%ef%bc%8d%ef%bd%94%e3%82%b0%e3%83%a9%e3%83%95%e3%81%ab/%e5%9b%b3%ef%bc%93-2-2