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50 8 50 9 51 0 51 1 51 2 51 3 51 4 51 5 51 6 51 7 51 8 51 9 52 0 52 1 52 2 52 3 1993 1992 1991 1990 1989 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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