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15 01 15 02 15 03 15 04 15 05 15 06 15 07 15 08 15 09 15 10 15 11 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973

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