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12 21 12 22 12 23 12 24 12 25 12 26 12 27 12 28 12 29 12 30 12 31 1900 1899 1898 1897 1896 1895 1894 1893 1892 1891

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