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91 3 91 4 91 5 91 6 91 7 91 8 91 9 92 0 92 1 92 2 92 3 1978 1977 1976 1975 1974 1973 1972 1971 1970 1969

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