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Masahide MONDE
Research Institute, Printing Bureau, Ministry of Finance, Odawara, Kanagawa, 256 Japan
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Tsuyoshi UEMATSU
Research Institute, Printing Bureau, Ministry of Finance, Odawara, Kanagawa, 256 Japan
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Toshiki TODA
Technical Research Institute, Toppan Printing Co. Ltd., Kitakatsushika, Saitama, 345 Japan
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Kazuhiko OHNUMA
Department of Information and Computer Science, Faculty of Engineering, Chiba University, Chiba, 263 Japan
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Yoshizumi YASUDA
Department of Information and Computer Science, Faculty of Engineering, Chiba University, Chiba, 263 Japan