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91 4 91 5 91 6 91 7 91 8 91 9 92 0 92 1 92 2 92 3 92 4 1921 1920 1919 1918 1917 1916 1915 1914 1913 1912

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