Prof. Turnbull I submit my homework. http://search.japantimes.co.jp/cgi-bin/nn20091104a2.html Key words I chose waste-cutting groups I don't found any articles above this article. --------------------------- 大南堅資<OMINAMI Kensuke> 筑波大学理工学群 社会工学類2年 ominami80 at sk.tsukuba.ac.jp ---------------------------