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29 7 29 8 29 9 30 0 30 1 30 2 30 3 30 4 30 5 30 6 30 7 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982

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