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WikiPedia: Unadon http://www.excite.co.jp/News/bit/00091184601035.ht... https://books.google.com/books?id=1LZQAQAAIAAJ https://books.google.com/books?id=LIMVAAAAMAAJ https://books.google.com/books?id=R9XWAAAAMAAJ https://books.google.com/books?id=y2UfAQAAMAAJ