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77 4 77 5 77 6 77 7 77 8 77 9 78 0 78 1 78 2 78 3 78 4 1884 1883 1882 1881 1880 1879 1878 1877 1876 1875

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