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90 7 90 8 90 9 91 0 91 1 91 2 91 3 91 4 91 5 91 6 91 7 1975 1974 1973 1972 1971 1970 1969 1968 1967 1966

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