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79 7 79 8 79 9 80 0 80 1 80 2 80 3 80 4 80 5 80 6 80 7 80 8 80 9 81 0 81 1 81 2 1932 1931 1930 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920 1919 1918

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