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18 90 18 91 18 92 18 93 18 94 18 95 18 96 18 97 18 98 18 99 19 00 1937 1936 1935 1934 1933 1932 1931 1930 1929 1928

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