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10 71 10 72 10 73 10 74 10 75 10 76 10 77 10 78 10 79 10 80 10 81 1979 1978 1977 1976 1975 1974 1973 1972 1971 1970

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