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18 59 18 60 18 61 18 62 18 63 18 64 18 65 18 66 18 67 18 68 18 69 2006 2005 2004 2003 2002 2001 2000 1999 1998 1997

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