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20 7 20 8 20 9 21 0 21 1 21 2 21 3 21 4 21 5 21 6 21 7 21 8 21 9 22 0 22 1 22 2 1915 1914 1913 1912 1911 1910 1909 1908 1907 1906 1905 1904 1903 1902 1901

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