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17 73 17 74 17 75 17 76 17 77 17 78 17 79 17 80 17 81 17 82 17 83 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961

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