Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the odd letter-cluster.
In ABHI, CDJK, LMST, the number of letters between the second and the third letter is 5. In OPTU, the number letters between the second and the third letter is 3.
$$\therefore\ \ $$OPTU is the odd one among the given letter-clusters.
Hence, the correct answer is Option D
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