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15 07 15 08 15 09 15 10 15 11 15 12 15 13 15 14 15 15 15 16 15 17 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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