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90 0 90 1 90 2 90 3 90 4 90 5 90 6 90 7 90 8 90 9 91 0 1920 1919 1918 1917 1916 1915 1914 1913 1912 1911

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