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16 97 16 98 16 99 17 00 17 01 17 02 17 03 17 04 17 05 17 06 17 07 2000 1999 1998 1997 1996 1995 1994 1993 1992 1991

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