DSSSB · Reasoning

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

  1. LUN
  2. IRL
  3. NWP
  4. GPI
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