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10 80 10 81 10 82 10 83 10 84 10 85 10 86 10 87 10 88 10 89 10 90 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975

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