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13 12 13 13 13 14 13 15 13 16 13 17 13 18 13 19 13 20 13 21 13 22 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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