Letter cluster analogy: each letter written as two letters (its neighbours, or the next or previous two)

This type of question, asked 4 times: 17 Jul 2023 S2, 25 Jul 2023 S4, 11 Sep 2024 S3, 13 Sep 2025 S3. All 4 questions below, oldest first.

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Question 1
17 Jul 2023 S2
7 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. BULL: CDVWMNMN :: SHOT: TUIJPQUV :: TENS: ?$
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Question 2
25 Jul 2023 S4
14 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. GIST: FEHGRQSR :: DUCK: CBTSBAJI :: LOPE: ?$
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Question 3
11 Sep 2024 S3
13 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. OUR : NPTVQS : : BIG : ACHJFH : : FOR : ?$
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Question 4
13 Sep 2025 S3
10 $In each of the following questions, the second word is formed by applying a specific alphabetic coding pattern to the first word. Apply the same pattern to the third word to determine the correct option from the given alternatives. CUT : BDTVSU :: TIP : ?$
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Question 1