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Submitted on: 14 November 1998.
Revised on: 11 March 1999.
Accepted on: 07 April 1999.
___________________COMPUTATIONAL LINGUISTICS---MIT PRESS
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http://reply.papertrans.cn/1/62/6189/6189-34.png
http://reply.papertrans.cn/1/62/6189/6189-35.png
Submitted on: 10 July 2014.
Revised on: 10 October 2014.
Accepted on: 22 October 2014.
___________________COMPUTATIONAL LINGUISTICS---MIT PRESS