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19 6 19 7 19 8 19 9 20 0 20 1 20 2 20 3 20 4 20 5 20 6 20 7 20 8 20 9 21 0 21 1 1957 1956 1955 1954 1953 1952 1951 1950 1949 1948 1947 1946 1945 1944 1943

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