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18 27 18 28 18 29 18 30 18 31 18 32 18 33 18 34 18 35 18 36 18 37 1901 1900 1899 1898 1897 1896 1895 1894 1893 1892

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