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17 19 17 20 17 21 17 22 17 23 17 24 17 25 17 26 17 27 17 28 17 29 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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