In a certain language, COMPUTER is coded as OCPMTURE. How is KEYBOARD coded in that code?
EKBYAODR
The trick in this coding is to look at what happens to small groups of letters rather than the whole word at once. Break the word into consecutive pairs and study each pair on its own.
COMPUTER splits into the pairs CO, MP, UT, ER. Now compare this with the given code OCPMTURE.
Swapping the two letters inside each pair turns CO into OC, MP into PM, UT into TU and ER into RE. Joined together these give OCPMTURE, exactly the code supplied, which confirms the rule.
So the rule is: keep the pairs in the same left-to-right order, but reverse the two letters within every pair.
Apply the same rule to KEYBOARD. Split it into pairs: KE, YB, OA, RD.
Reversing each pair gives EK, BY, AO, DR, and writing them in order produces EKBYAODR.
Hence KEYBOARD is coded as EKBYAODR.
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