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15 90 15 91 15 92 15 93 15 94 15 95 15 96 15 97 15 98 15 99 16 00 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972

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