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10 77 10 78 10 79 10 80 10 81 10 82 10 83 10 84 10 85 10 86 10 87 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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