In a certain code, PAPER is written as REPAP. What is the rule?
- A. each letter is shifted forward
- B. the word is written in reverse order
- C. vowels are replaced by consonants
- D. alternate letters are swapped
Explanation
Reading PAPER backwards gives REPAP exactly, with no letter changed. Reversal codes are recognised by the fact that the same set of letters appears in the output. Comparing the letter sets of input and output is the first check worth making.
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