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51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 1903 1902 1901 1900 1899 1898 1897 1896 1895 1894 1893 1892 1891 1890 1889

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