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17 51 17 52 17 53 17 54 17 55 17 56 17 57 17 58 17 59 17 60 17 61 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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