Four letter-clusters are given: ONM, BCD, RST, JKL. Three are alike in some manner and one is different. Select the one that is different. (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster.)

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Let's analyze the given letter clusters:

1. ONM
2. BCD
3. RST
4. JKL

BCD, RST, and JKL are all sequences of three consecutive letters in alphabetical order:
- B, C, D
- R, S, T
- J, K, L

ONM, however, is a sequence of three consecutive letters in reverse (descending) order:
- O, N, M

Thus, ONM is the odd one out because it is the only cluster where the letters are in reverse alphabetical order, while the others are in forward alphabetical order.

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