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18 25 18 26 18 27 18 28 18 29 18 30 18 31 18 32 18 33 18 34 18 35 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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