Odd 3-letter cluster: letters at a fixed skip of +3

The same question, asked 2 times: 17 Sep 2024 S1*, 24 Sep 2024 S2. Every wording below, oldest first.

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Question 1
17 Sep 2024 S1
17 $Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the one that is different. Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster.$
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Question 2
24 Sep 2024 S2
4 $Four letter-clusters have been given, out of which three are alike in some manner and one is different. Select the letter-cluster that is different. Note: The odd one out is not based on the number of consonants/vowels or their position in the letter cluster.$
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Question 1