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18 23 18 24 18 25 18 26 18 27 18 28 18 29 18 30 18 31 18 32 18 33 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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