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66 7 66 8 66 9 67 0 67 1 67 2 67 3 67 4 67 5 67 6 67 7 67 8 67 9 68 0 68 1 68 2 1973 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959

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