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12 31 12 32 12 33 12 34 12 35 12 36 12 37 12 38 12 39 12 40 12 41 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972

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