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Submitted on: 26 February 2011.
Revised on: 13 March 2011.
Accepted on: 30 March 2011.
Transactions of the Association for Computational Linguistics
Submitted on: 18 February 2007.
Revised on: 22 March 2007.
Accepted on: 01 April 2007.
Transactions of the Association for Computational Linguistics
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Submitted on: 14 July 2008.
Revised on: 16 August 2008.
Accepted on: 13 September 2008.
Transactions of the Association for Computational Linguistics
Submitted on: 21 January 2008.
Revised on: 20 February 2008.
Accepted on: 13 March 2008.
Transactions of the Association for Computational Linguistics