Three-letter clusters: every letter replaced by its opposite letter (A-Z, B-Y)

The same question, asked 5 times: 20 Jul 2023 S1*, 25 Jul 2023 S2*, 9 Sep 2024 S1*, 23 Sep 2024 S3*, 26 Sep 2024 S3. Every wording below, oldest first.

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Question 1
20 Jul 2023 S1
4 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. RAT : IZG :: YUM : BFN :: SIP : ?$
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Question 2
25 Jul 2023 S2
5 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. MAP: NZK ::HOZ:SLA :: WQK:?$
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Question 3
9 Sep 2024 S1
11 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. MEK: NVP :: GYT: TBG :: JWH:?$
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Question 4
23 Sep 2024 S3
4 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. MSD: NHW :: OAE : LZV :: NIP:?$
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Question 5
26 Sep 2024 S3
11 $Select the option that is related to the fifth letter-cluster in the same way as the second letter-cluster is related to the first letter-cluster and the fourth letter-cluster is related to the third letter-cluster. WEL: DVO :: FOR: ULI :: SDX:?$
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Three-letter clusters: every letter replaced by its opposite letter (A-Z, B-Y)

Question 1

Question 2

Question 3

Question 4

Question 5