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70 4 70 5 70 6 70 7 70 8 70 9 71 0 71 1 71 2 71 3 71 4 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985

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