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80 6 80 7 80 8 80 9 81 0 81 1 81 2 81 3 81 4 81 5 81 6 81 7 81 8 81 9 82 0 82 1 1972 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958

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