Structure: 'P' + digit + 'Q' + trailing letter.
- First letter: constant 'P'.
- Digit: 5, 4, 3, 2, 1 (counting down by 1).
- Third character: constant 'Q'.
- Last letter: R, S, T, U, V (+1 each step).
Concept/ApproachDecompose the token and apply independent progressions: numeric countdown; alphabetic +1 on the tail.Step-by-Step calculationNext after P3QT is P2QU with digit 2 and tail advanced from T to U.Verification/AlternativeFinal given term P1QV confirms the countdown to 1 and tail letter V.Common pitfallsIncrementing the digit instead of decrementing or shifting the wrong letter (the Q is fixed).Final AnswerP2QU
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