board of education in Moriya, Ibaraki Prefecture

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Institute for solid state physics, the university of Tokyo

Kashiwa-shi, 277-0882 Kashiwa-shi, Japan

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Faculty of Horticulture, Chiba University

松戸６４８, 271-8510 Matsudo-shi, Japan

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Graduate School of Frontier Sciences, The University of Tokyo

Kashiwa-shi, 277-8561 Kashiwa-shi, Japan