The form is (Letter, 'A', Letter) with +1 steps on the outer letters.
- First letters: Q → R → S → T → U (+1).
- Second letters: constant 'A'.
- Third letters: R → S → T → U → V (+1).
Concept/ApproachHold the middle fixed; treat the ends as synchronized forward progressions.Step-by-Step calculationAfter TAU, increment first and last: T→U, U→V ⇒ UAV.Verification/AlternativeCheck neighbors: SAT → TAU → UAV confirms steady +1 on the ends.Common pitfallsAltering the middle 'A' or reversing the direction on one side.Final AnswerUAV
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