OBE, PDH, QFK, RHN, ?
Relation between the first letter of each terms
$$O \ \underrightarrow{+1}Â \ P \ \underrightarrow{+1}Â \ Q \ \underrightarrow{+1}Â \ R \ \underrightarrow{+1}Â \ S$$
Relation between the second letter of each terms
$$B \ \underrightarrow{+2} \ D \ \underrightarrow{+2} \ F \ \underrightarrow{+2} \ H \ \underrightarrow{+2} \ J$$
Relation between the third letter of each terms
$$E \ \underrightarrow{+3} \ H \ \underrightarrow{+3} \ K \ \underrightarrow{+2} \ N \ \underrightarrow{+2} \ Q$$
So next term will be SJQ
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