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36 80 36 81 36 82 36 83 36 84 36 85 36 86 36 87 36 88 36 89 36 90 1999 1998 1997 1996 1995 1994 1993 1992 1991 1990

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