The author would like to thank Kiyomi AKITA, Professor, Gakushuin University, Faculty of Letters, Toshihiko ENDO, Professor, the University of Tokyo, Graduate School of Education, Sachiko ASAI, Professor, the University of Tokyo, Graduate School of Education, Yumi YODOGAWA, Associate Professor, Chiba University, Faculty of Education, for supporting this research. The work was supported by KAKENHI(JP19H05590) and POPLAR Publishing Co., Ltd.

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