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20 6 20 7 20 8 20 9 21 0 21 1 21 2 21 3 21 4 21 5 21 6 1941 1940 1939 1938 1937 1936 1935 1934 1933 1932

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