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18 31 18 32 18 33 18 34 18 35 18 36 18 37 18 38 18 39 18 40 18 41 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986

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