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10 42 10 43 10 44 10 45 10 46 10 47 10 48 10 49 10 50 10 51 10 52 1988 1987 1986 1985 1984 1983 1982 1981 1980 1979

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