Alternating Caesar shift (−3, +3): Corden : zrogbq :: ? : pxivro

Introduction / Context:
This analogy uses an alternating Caesar shift, switching direction on each successive letter. Recognizing alternating operations is essential in decoding many exam-style letter coding problems.

Given Data / Assumptions:

• Corden → zrogbq.
• We must find a word that transforms to pxivro under the same rule.
• Pattern observed in the first pair appears to be −3, +3, −3, +3, … per letter.

Concept / Approach:
Verify the alternating pattern on the first mapping, then invert the process to recover the preimage for pxivro. Use A=1 … Z=26 and modular wrap-around.

Step-by-Step Solution:

Verification / Alternative check:
Apply the forward alternating rule to “sulsul”: s→p (−3), u→x (+3), l→i (−3), s→v (+3), u→r (−3), l→o (+3). This reproduces pxivro exactly.

Why Other Options Are Wrong:

• mulmul/munmun/srspql: None produce pxivro when the exact alternating −3/+3 rule is applied throughout.

Common Pitfalls:
Applying a constant shift to all letters, or reversing the alternation mid-word. Keep careful track of positions and signs.

Final Answer:
sulsul