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15 52 15 53 15 54 15 55 15 56 15 57 15 58 15 59 15 60 15 61 15 62 15 63 15 64 15 65 15 66 15 67 15 68 15 69 15 70 15 71 15 72 15 73 15 74 1960 1959 1958 1957 1956 1955 1954 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