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50 7 50 8 50 9 51 0 51 1 51 2 51 3 51 4 51 5 51 6 51 7 1960 1959 1958 1957 1956 1955 1954 1953 1952 1951

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