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36 81 36 82 36 83 36 84 36 85 36 86 36 87 36 88 36 89 36 90 36 91 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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