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Uploaded by KUMONSHUPPAN on Jan 5, 2010
http://www.kumonshuppan.com/jsp/servlet/coreServlet?category=shohin&shohi...水を入れた専用ペン(アクアペン)で書くと色が変わり、数分で乾くと元の色に戻るので何度でも練習が出来ます。もちろん、手も衣服も汚れません。
Education
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