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First Author:
 
Katsuhiro Sugita
Faculty of Law and Letters, University of the Ryukyus
ksugita@ll.u-ryukyu.ac.jp
 
1 Senbaru,
Nishihara, 903-0213, Japan
 
+81 98 8958861(Phone)
+81 98 8958861(Fax)