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17 81 17 82 17 83 17 84 17 85 17 86 17 87 17 88 17 89 17 90 17 91 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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