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57 8 57 9 58 0 58 1 58 2 58 3 58 4 58 5 58 6 58 7 58 8 58 9 59 0 59 1 59 2 59 3 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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