Code = word reversed, then each letter +2: code a new word

The same question, asked 2 times: 6 Mar 2023 Tier II*, 7 Mar 2023 Tier II. Every wording below, oldest first.

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Question 1
6 Mar 2023 Tier II
45 $In a code language, 'PLUMAGE' is written as ‘GICOWNR’ and 'CRUSH' is written as 'JUWTE'. How will 'TRIBAL' be written in that language?$
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Question 2
7 Mar 2023 Tier II
32 $In a code language, 'SLAIN' is written as ‘PKCNU’ and 'DENT' is written as 'VPGF'. How will 'CUBOID' be written in that language?$
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