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51 3 51 4 51 5 51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 52 4 52 5 52 6 52 7 52 8 52 9 53 0 53 1 53 2 53 3 53 4 53 5 1940 1939 1938 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920 1919

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