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18 81 18 82 18 83 18 84 18 85 18 86 18 87 18 88 18 89 18 90 18 91 1893 1892 1891 1890 1889 1888 1887 1886 1885 1884

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