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98 4 98 5 98 6 98 7 98 8 98 9 99 0 99 1 99 2 99 3 99 4 99 5 99 6 99 7 99 8 99 9 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983

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