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15 63 15 64 15 65 15 66 15 67 15 68 15 69 15 70 15 71 15 72 15 73 1997 1996 1995 1994 1993 1992 1991 1990 1989 1988

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