I don't get it

month

2012 2013

January
February
March
April
May
June
July
August
September
October
November
December

2011 2012 2013

January
February
March
April
May
June
July
August
September
October
November
December

2010 2011 2012

January
February
March
April
May
June
July
August
September
October
November
December

2009 2010 2011

January
February
March
April
May
June
July
August
September
October
November
December

2009 2010

January
February
March
April
May
June
July
August
September
October
November
December

January 2012

December 2011

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