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18 10 18 11 18 12 18 13 18 14 18 15 18 16 18 17 18 18 18 19 18 20 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972

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