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51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 52 4 52 5 52 6 1891 1890 1889 1888 1887 1886 1885 1884 1883 1882

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