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17 90 17 91 17 92 17 93 17 94 17 95 17 96 17 97 17 98 17 99 18 00 1986 1985 1984 1983 1982 1981 1980 1979 1978 1977

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