Based on the position in the English alphabetical order, three of the following letter-clusters are alike in some manner and one is different. Select the odd letter-cluster. 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 letter clusters based on the positions of the letters in the English alphabet:

1. TWGD
T = 20, W = 23, G = 7, D = 4
Differences: W - T = 3, G - W = -16, D - G = -3

2. PSKI
P = 16, S = 19, K = 11, I = 9
Differences: S - P = 3, K - S = -8, I - K = -2

3. MPNK
M = 13, P = 16, N = 14, K = 11
Differences: P - M = 3, N - P = -2, K - N = -3

4. JMQN
J = 10, M = 13, Q = 17, N = 14
Differences: M - J = 3, Q - M = 4, N - Q = -3

Observing the differences:
- In clusters 1, 3, and 4, the first difference is +3, and the last difference is -3.
- In cluster 2, the first difference is +3, but the last difference is -2, which breaks the pattern.

Hence, PSKI is the odd one out because it does not follow the pattern of having the first difference as +3 and the last difference as -3.

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