I think the answer is XFO.
Consider the first 3 sets.In that ABC,JKL,STU occupies different position.That is the position occupied by A is nt occupied by its sequence B or C upto the third set.
Assuming this logic., in the next set., DE has occupied the positions 1 and 3 and so F must occupy 2nd place.
Similarly., O should go to the last and X to the front..
Manoj must give the answer!!!





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