Four-letter clusters: letters move -4, -3, -2, -1

The same question, asked 2 times: 9 Sep 2024 S1*, 10 Sep 2024 S1. Every wording below, oldest first.

Try each one first, then open its answer.

Question 1
9 Sep 2024 S1
22 $Which of the following terms will replace the question mark (?) in the given series? YZUW, ?, QTQU, MQOT, INMS$
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Question 2
10 Sep 2024 S1
22 $Which letter-cluster will replace the question mark (?) to complete the given series? ZVRN, VSPM, RPNL, ?, JJJJ$
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