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17 29 17 30 17 31 17 32 17 33 17 34 17 35 17 36 17 37 17 38 17 39 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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