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52 4 52 5 52 6 52 7 52 8 52 9 53 0 53 1 53 2 53 3 53 4 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903

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