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http://www.ethics.bun.kyoto-u.ac.jp/~mizutani/TheBA9.html
http://www.alc.co.jp/edunet/column/cmpeth29.html
http://clinamen.ff.tku.ac.jp/CENSORSHIP/Censorship.html
http://www.asahi-net.or.jp/~VR5J-MKN/cdaj001.htm
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Last modified: Mon Feb 7 16:48:51 JST 2000