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Yoshihiro Hashihara
Hiroshima University, Faculty of lntegrated Arts and Sciences
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Zhi-Wei Jin
Hiroshima University, Faculty of Education
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Takeshi Sagano
Kure National College of Technology
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Takashi Komura
Hiroshima University, Faculty of lntegrated Arts and Sciences
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Kiyomi Nishimura
Hiroshima University, Faculty of Education