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13 20 13 21 13 22 13 23 13 24 13 25 13 26 13 27 13 28 13 29 13 30 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973

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