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*Tetsuhisa Deguchi
Hokkaido University of Education, Sapporo branch
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Eigo Itoh
Graduate School of Agriculture, Hokkaido University
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Takumi Naya
Graduate School of Agriculture, Hokkaido University
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Kei Furukawa
Graduate School of Agriculture, Hokkaido University
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Manabu Matsumoto
Graduate School of Agriculture, Hokkaido University
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Kazuto Iwama
Graduate School of Agriculture, Hokkaido University