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March 2006	April 2006
May 2006	June/July 2006
December 2006	June/July 2007
August / September 2007	September / October 2007
December/January 2008	February/March 2008
April/May 2008	June/July 2008
August/September 2008	October/November 2008
December 2008/January 2009	February/March 2009
April / May 2009	June / July 2009
Aug / Sept 2009	Oct / Nov 2009
December 2009	Jan / Feb 2010
March/April 2010	May/June 2010