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10 52 10 53 10 54 10 55 10 56 10 57 10 58 10 59 10 60 10 61 10 62 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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