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15 50 15 51 15 52 15 53 15 54 15 55 15 56 15 57 15 58 15 59 15 60 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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