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51 1 51 2 51 3 51 4 51 5 51 6 51 7 51 8 51 9 52 0 52 1 1885 1884 1883 1882 1881 1880 1879 1878 1877 1876

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