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50 4 50 5 50 6 50 7 50 8 50 9 51 0 51 1 51 2 51 3 51 4 51 5 51 6 51 7 51 8 51 9 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975 1974 1973 1972 1971

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