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55 3 55 4 55 5 55 6 55 7 55 8 55 9 56 0 56 1 56 2 56 3 1960 1959 1958 1957 1956 1955 1954 1953 1952 1951

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