Which letter-cluster will replace the question mark (?) in the following series?
PRT, TVX, ?, BDF, FHJ
$$P \ \underrightarrow{+1(Q skip)} \ R \ \underrightarrow{+1(Q skip)}Â \ T $$,
$$T \ \underrightarrow{+1(U skip)} \ V \ \underrightarrow{+1(W skip)} \ X$$,
$$X \ \underrightarrow{+1(Y skip)} \ Z \ \underrightarrow{+1(A skip)} \ B$$
So, ? will be replaced by XZB
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