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This paper proposes an architecture for an open-domain conversational system and evaluates an implemented system. The proposed architecture is fully composed of modules based on natural language processing techniques. Experimental results using human subjects show that our architecture achieves significantly better naturalness than a retrieval-based baseline and that its naturalness is close to that of a rule-based system using 149K hand-crafted rules.dblp:conf/coling/HigashinakaIMMKSHMM14 fatcat:zfwvaly5frenpn3ebyg6ijy4p4