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17 91 17 92 17 93 17 94 17 95 17 96 17 97 17 98 17 99 18 00 18 01 2007 2006 2005 2004 2003 2002 2001 2000 1999 1998

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