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17 54 17 55 17 56 17 57 17 58 17 59 17 60 17 61 17 62 17 63 17 64 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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