Discussion
In a certain code, COKE is coded as DPLF. How COLA will be coded in that language?
Answer: C
COLA is coded as DPMB. In COKE to DPLF each letter moves one place forward in the alphabet: C to D, O to P, K to L and E to F. Applying the same rule to COLA gives C to D, O to P, L to M and A to B, so the code is DPMB. BMPD moves each letter one place backward instead. DPBM keeps the right first two letters but swaps the last two, and BMDP reverses the order of the answer pairs, so neither follows the rule.
As a check, the same one-place shift applied to the other letters of the given word, K to L and E to F, reproduces DPLF, so the rule is a uniform forward shift of one for every letter.
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