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18 49 18 50 18 51 18 52 18 53 18 54 18 55 18 56 18 57 18 58 18 59 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983

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