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*Tomohiro Takahashi
Graduate School of Education, Fukushima University
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Yoshitaka Nagahashi
Graduate School of Education, Fukushima University
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Yukio Yanagisawa
AIST Institute of Geoscience
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Takeyoshi Yoshida
Graduate School of Science, Tohoku University
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Katsuki Kurokawa
Faculty of Education and Human Sciences, Niigata University