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12 10 12 11 12 12 12 13 12 14 12 15 12 16 12 17 12 18 12 19 12 20 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981

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