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10 30 10 31 10 32 10 33 10 34 10 35 10 36 10 37 10 38 10 39 10 40 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971

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