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12 75 12 76 12 77 12 78 12 79 12 80 12 81 12 82 12 83 12 84 12 85 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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