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74 7 74 8 74 9 75 0 75 1 75 2 75 3 75 4 75 5 75 6 75 7 1942 1941 1940 1939 1938 1937 1936 1935 1934 1933

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