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First Author:
 
Takuma Kamada
Graduate School of Arts and Letters, Tohoku University
takuma206@gmail.com
 
27-1 Kawauchi Aoba-ku
Sendai, 980-8576, Japan
 
+81-22-795-6037(Phone)
+81-22-795-6037(Fax)

Second Author:

Hajime Katayama
School of Commerce, Waseda University
hajime.katayama@waseda.jp
 
1-6-1 Nishi-Waseda, 1-6-1 Nishi-Waseda
Shinjuku, 169-8050, Japan