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Submitted on: 06 March 1999.
Revised on: 19 May 1999.
Accepted on: 06 June 1999.
___________________BULLETIN OF SYMBOLIC LOGIC---CAMBRIDGE UNIV PRESS
Submitted on: 03 June 2012.
Revised on: 15 July 2012.
Accepted on: 11 August 2012.
___________________BULLETIN OF SYMBOLIC LOGIC---CAMBRIDGE UNIV PRESS
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Submitted on: 12 March 2019.
Revised on: 02 July 2019.
Accepted on: 29 July 2019.
___________________BULLETIN OF SYMBOLIC LOGIC---CAMBRIDGE UNIV PRESS
Submitted on: 09 February 1998.
Revised on: 28 April 1998.
Accepted on: 27 May 1998.
___________________BULLETIN OF SYMBOLIC LOGIC---CAMBRIDGE UNIV PRESS
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Submitted on: 06 March 2005.
Revised on: 17 May 2005.
Accepted on: 12 June 2005.
___________________BULLETIN OF SYMBOLIC LOGIC---CAMBRIDGE UNIV PRESS