Choose the letter cluster that is different:

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A BD
B IK
C PN
D SU

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Answer: C. PN

Answer: (C) PN
Explanation: In options (A) BD (+2), (B) IK (+2), and (D) SU (+2), the letters follow an alphabetical skip-one pattern ( 2nd letter is +2 from 1st). In PN, N comes before P in alphabetical order (reverse) or P,Q,R,S,T,U,N (not standard +2)

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Choose the letter cluster that is different:

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