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The experimental results show that our system is effective for 'why ' and 'definition' questions. ... For 'why' questions, hand-crafted rules were used in previous work for answer candidate extraction  . However, such rules greatly depend on developers' intuition and are costly to make. ... Summary We presented the overview of NTT's Question Answering System for QAC-4. ...dblp:conf/ntcir/HigashinakaI07 fatcat:7zin5u2epfdonkbnevwgo2jwfi