Select the letter-cluster from among the given options that can replace the question mark (?) in the following series. BRF, EUH, HXJ, KAL, ?
NDN
Pattern: First letter +3, second letter +3, third letter +2.
B → E → H → K → N (each +3)
R → U → X → A → D (each +3, wrapping after Z)
F → H → J → L → N (each +2)
Hence, the correct answer is NDN.
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