version 1.0, on 1 February 2007 (GT KP version)
version 1.1, on 2 February 2007
version 1.2, on 9 July 2007 (OT KP version)
version 2.0, on 20 May 2010 (OT1 version)
version 3.0, on 9 June 2011 (OT2 version)
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