1. International College of Arts and Sciences; Fukuoka Women's University; Higashi-ku Fukuoka 813-8529 Japan
2. Kagawa School of Pharmaceutical Sciences; Tokushima Bunri University; Sanuki Kagawa 769-2193 Japan
3. Research Center of Mathematics for Social Creativity, Research Institute of Electronic Science; Hokkaido University; Sapporo Hokkaido 060-0812 Japan
4. Japan Science and Technology Agency; CREST; Kawaguchi Saitama 332-0012 Japan