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17 81 17 82 17 83 17 84 17 85 17 86 17 87 17 88 17 89 17 90 17 91 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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