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18 71 18 72 18 73 18 74 18 75 18 76 18 77 18 78 18 79 18 80 18 81 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928

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