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13 87 13 88 13 89 13 90 13 91 13 92 13 93 13 94 13 95 13 96 13 97 1998 1997 1996 1995 1994 1993 1992 1991 1990 1989

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