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15 17 15 18 15 19 15 20 15 21 15 22 15 23 15 24 15 25 15 26 15 27 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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