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17 97 17 98 17 99 18 00 18 01 18 02 18 03 18 04 18 05 18 06 18 07 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920

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