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51 7 51 8 51 9 52 0 52 1 52 2 52 3 52 4 52 5 52 6 52 7 2008 2007 2006 2005 2004 2003 2002 2001 2000 1999

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