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56 9 57 0 57 1 57 2 57 3 57 4 57 5 57 6 57 7 57 8 57 9 58 0 58 1 58 2 58 3 58 4 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975

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