| Author information
Mamoru Doi:
11-9-302 Yumoto-cho, Takarazuka
Hyogo, 665-0003, Japan
doi.mamoru@gmail.com
Naoto Yotsutani:
Kagawa University
Faculty of education, Mathematics
Saiwaicho 1-1, Takamatsu
Kagawa, 760-8522, Japan
yotsutani.naoto@kagawa-u.ac.jp
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