Upon careful observation first letters are decremented by tow letters . It means S , U ,W coming as first characters in the right to left order . Hence next letter must be Y by skipping X . Second letters are coming in series by removing one intermediate character in the left to right order . That is _D__,_F__,_H__ . hence B must come as second character in first set that is _B__ . The first character logic is valid for third character and second character logic is valid for fourth letter .
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