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49 9 50 0 50 1 50 2 50 3 50 4 50 5 50 6 50 7 50 8 50 9 51 0 51 1 51 2 51 3 51 4 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