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15 27 15 28 15 29 15 30 15 31 15 32 15 33 15 34 15 35 15 36 15 37 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976

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