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74 4 74 5 74 6 74 7 74 8 74 9 75 0 75 1 75 2 75 3 75 4 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943

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