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79 4 79 5 79 6 79 7 79 8 79 9 80 0 80 1 80 2 80 3 80 4 2011 2010 2009 2008 2007 2006 2005 2004 2003 2002

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