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12 51 12 52 12 53 12 54 12 55 12 56 12 57 12 58 12 59 12 60 12 61 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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