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71 9 72 0 72 1 72 2 72 3 72 4 72 5 72 6 72 7 72 8 72 9 73 0 73 1 73 2 73 3 73 4 1951 1950 1949 1948 1947 1946 1945 1944 1943 1942 1941 1940 1939 1938 1937

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