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17 02 17 03 17 04 17 05 17 06 17 07 17 08 17 09 17 10 17 11 17 12 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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