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27 0 27 1 27 2 27 3 27 4 27 5 27 6 27 7 27 8 27 9 28 0 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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