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81 4 81 5 81 6 81 7 81 8 81 9 82 0 82 1 82 2 82 3 82 4 82 5 82 6 82 7 82 8 82 9 1971 1970 1969 1968 1967 1966 1965 1964 1963 1962 1961 1960 1959 1958 1957

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