Find the odd letter triple (forward-then-back pattern): Select the item that does not follow “forward step, then backward step” behavior.

Introduction / Context:
Some triples are constructed with a forward move from the 1st to 2nd letter and a backward move from the 2nd to 3rd. Items that use two backward moves (or two forward moves) deviate from this template.

Given Data / Assumptions:

• P→Q (+1), Q→O (−2) → forward then back.
• T→W (+3), W→S (−4) → forward then back.
• V→B (wrap large negative), B→U (+) → still exhibits a forward/back alternation in net behavior.
• A→Z (−1), Z→Y (−1) → both backward; “AZY” breaks the alternation.

Concept / Approach:
We are not enforcing step sizes, only the direction change (+ then −). The item that lacks this directional alternation is the outlier.

Step-by-Step Solution:

Verification / Alternative check:
Even allowing wrap-around arithmetic, “AZY” does not include a forward step.

Why Other Options Are Wrong:
They include a forward/back (or back/forward) alternation.

Common Pitfalls:
Do not fixate on the magnitude; only the direction change matters for this classification.

Final Answer:
AZY