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19 9 20 0 20 1 20 2 20 3 20 4 20 5 20 6 20 7 20 8 20 9 21 0 21 1 21 2 21 3 21 4 1944 1943 1942 1941 1940 1939 1938 1937 1936 1935 1934 1933 1932 1931 1930

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