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71 7 71 8 71 9 72 0 72 1 72 2 72 3 72 4 72 5 72 6 72 7 1873 1872 1871 1870 1869 1868 1867 1866 1865 1864

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