Submitted on: 22 October 1999.
Revised on: 07 January 2000.
Accepted on: 29 February 2000.
___________________COMPUTATIONAL LINGUISTICS---MIT PRESS
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Submitted on: 10 October 2020.
Revised on: 04 January 2021.
Accepted on: 03 March 2021.
___________________COMPUTATIONAL LINGUISTICS---MIT PRESS
Submitted on: 30 March 2012.
Revised on: 30 May 2012.
Accepted on: 10 July 2012.
___________________COMPUTATIONAL LINGUISTICS---MIT PRESS