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12 10 12 11 12 12 12 13 12 14 12 15 12 16 12 17 12 18 12 19 12 20 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987

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