DSSSB · Reasoning

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

  1. UYB
  2. DGJ
  3. HKN
  4. YBE
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