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18 71 18 72 18 73 18 74 18 75 18 76 18 77 18 78 18 79 18 80 18 81 1898 1897 1896 1895 1894 1893 1892 1891 1890 1889

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