In a coding operation C0, SMART is changed to UQBLT and DROP is changed to OPQE.
The coding operation works as follows:
- Odd letter of the word is replaced by the letter that follows it (as per the alphabetical sequence)
- Even letter of the word is replaced with the one that immediately precedes the letter (in the alphabetical sequence)
- The word is written in reverse order to arrive at the code.
Similarly, for other operations of the series, C1,C2,C3….,Cn each letter is replaced by skipping n letter that precede or follow it.