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74 2 74 3 74 4 74 5 74 6 74 7 74 8 74 9 75 0 75 1 75 2 75 3 75 4 75 5 75 6 75 7 1930 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920 1919 1918 1917 1916

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