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72 6 72 7 72 8 72 9 73 0 73 1 73 2 73 3 73 4 73 5 73 6 1920 1919 1918 1917 1916 1915 1914 1913 1912 1911

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