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70 6 70 7 70 8 70 9 71 0 71 1 71 2 71 3 71 4 71 5 71 6 71 7 71 8 71 9 72 0 72 1 1953 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943 1942 1941 1940 1939

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