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12 24 12 25 12 26 12 27 12 28 12 29 12 30 12 31 12 32 12 33 12 34 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980

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