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71 9 72 0 72 1 72 2 72 3 72 4 72 5 72 6 72 7 72 8 72 9 1929 1928 1927 1926 1925 1924 1923 1922 1921 1920

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