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74 9 75 0 75 1 75 2 75 3 75 4 75 5 75 6 75 7 75 8 75 9 76 0 76 1 76 2 76 3 76 4 2013 2012 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999

= Free Coordinate    = Occupied(Single Region)     = Occupied (Var Region)     = Center of the grid