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12 84 12 85 12 86 12 87 12 88 12 89 12 90 12 91 12 92 12 93 12 94 1996 1995 1994 1993 1992 1991 1990 1989 1988 1987

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