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20 4 20 5 20 6 20 7 20 8 20 9 21 0 21 1 21 2 21 3 21 4 21 5 21 6 21 7 21 8 21 9 1994 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980

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