Three of the following four letter clusters are alike in a certain way and form a group. Identify the one that does NOT belong to that group: EJM, DIM, FKN, CHK.

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Let's analyze the pattern in each letter cluster:

1. EJM:
   - E (5th letter), J (10th), M (13th)
   - Differences: J-E = 5, M-J = 3

2. DIM:
   - D (4th), I (9th), M (13th)
   - Differences: I-D = 5, M-I = 4

3. FKN:
   - F (6th), K (11th), N (14th)
   - Differences: K-F = 5, N-K = 3

4. CHK:
   - C (3rd), H (8th), K (11th)
   - Differences: H-C = 5, K-H = 3

Observation:
- In EJM, FKN, and CHK, the difference between the 1st and 2nd letters is 5, and between the 2nd and 3rd is 3.
- In DIM, the difference between the 1st and 2nd is 5, but between the 2nd and 3rd is 4.

Thus, 'DIM' does not follow the same pattern as the other three, making it the odd one out.

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