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18 53 18 54 18 55 18 56 18 57 18 58 18 59 18 60 18 61 18 62 18 63 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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