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Based on the English alphabetical order, three of the following four letter-cluster pairs are alike in a certain way and thus form a group. Which letter-cluster pair DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster.)

AKO-RN

BQU-XS

CNR-UP

DBF-ID

Answer:

A. KO-RN

Read Explanation:

KO-RN

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