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72 2 72 3 72 4 72 5 72 6 72 7 72 8 72 9 73 0 73 1 73 2 73 3 73 4 73 5 73 6 73 7 1894 1893 1892 1891 1890 1889 1888 1887 1886 1885 1884 1883 1882 1881 1880

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