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36 67 36 68 36 69 36 70 36 71 36 72 36 73 36 74 36 75 36 76 36 77 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971

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