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83 0 83 1 83 2 83 3 83 4 83 5 83 6 83 7 83 8 83 9 84 0 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972

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