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10 50 10 51 10 52 10 53 10 54 10 55 10 56 10 57 10 58 10 59 10 60 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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