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15 29 15 30 15 31 15 32 15 33 15 34 15 35 15 36 15 37 15 38 15 39 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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