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							Sakamoto Shuichi
														
									Research Institute of Electrical Communication / Graduate School of Information Sciences, Tohoku University
							 
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							Osada Yusuke
														
									Research Institute of Electrical Communication / Graduate School of Information Sciences, Tohoku University
							 
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							Suzuki Yôiti
														
									Research Institute of Electrical Communication / Graduate School of Information Sciences, Tohoku University
							 
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							Gyoba Jiro
														
									Graduate School / Faculty of Arts and Letters, Tohoku University