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2Kyoto Prefectural University, 1-5. Hangi-cho, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan
3Okayama University of Science, 1-1 Ridai-cho, Okayama, 700-0005, Japan
4Center for Chronological Research, Nagoya University, Chikusa, Nagoya 464-01, Japan
5Forestry and Forest Products Research Institute, Monoyama, Fushimi, Kyoto 612-0855, Japan
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