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52 7 52 8 52 9 53 0 53 1 53 2 53 3 53 4 53 5 53 6 53 7 53 8 53 9 54 0 54 1 54 2 1955 1954 1953 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943 1942 1941

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