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17 99 18 00 18 01 18 02 18 03 18 04 18 05 18 06 18 07 18 08 18 09 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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