1. Shigen Fang Ogata, Global Education Center, Waseda University; Graduate School of Education, Hyogo University of Teacher Education, 942-1 Shimokume, Kato-shi, Hyogo, Japan. Email: sogata@hyogo-u.ac.jp.
2. Yoshimasa Tawatsuji, Global Education Center, Waseda University; Center for Data Science, Waseda University, 1-6-1 Nishiwaseda, Tokyo, Japan. Email: y.tawatsuji@aoni.waseda.jp.
3. Tatsunori Matsui, Faculty of Human Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, Japan. Email: matsui-t@waseda.jp.