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60 9 61 0 61 1 61 2 61 3 61 4 61 5 61 6 61 7 61 8 61 9 1964 1963 1962 1961 1960 1959 1958 1957 1956 1955

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