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12 66 12 67 12 68 12 69 12 70 12 71 12 72 12 73 12 74 12 75 12 76 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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