丁寧で良い動画になったと自負してます。ゆっくり説明します。An explanation in English is below. miki3の動画リストのエクセル表のURLは（The URL for miki3's video list is：）
https://docs.google.com/spreadsheets/d/1JtpGNcaoMH8F_SL3zI4uMHRgPJQHAR9G/edit#gid=1351700554
It's a good and careful video. I'll explain slowly with a cut branch.