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24 8 24 9 25 0 25 1 25 2 25 3 25 4 25 5 25 6 25 7 25 8 25 9 26 0 26 1 26 2 26 3 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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