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51 3 51 4 51 5 51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 2010 2009 2008 2007 2006 2005 2004 2003 2002 2001

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