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50 3 50 4 50 5 50 6 50 7 50 8 50 9 51 0 51 1 51 2 51 3 1871 1870 1869 1868 1867 1866 1865 1864 1863 1862

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