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10 23 10 24 10 25 10 26 10 27 10 28 10 29 10 30 10 31 10 32 10 33 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970

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