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10 18 10 19 10 20 10 21 10 22 10 23 10 24 10 25 10 26 10 27 10 28 1995 1994 1993 1992 1991 1990 1989 1988 1987 1986

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