Submitted on: 26 December 2004.
Revised on: 05 March 2005.
Accepted on: 02 May 2005.
___________________BRITISH JOURNAL FOR THE PHILOSOPHY OF SCIENCE
Submitted on: 12 December 2006.
Revised on: 15 March 2007.
Accepted on: 04 May 2007.
___________________BRITISH JOURNAL FOR THE PHILOSOPHY OF SCIENCE
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