Four of the following five pairs are alike in a certain way and hence form a group. Which one does not belong to that group ?
The pattern of conversion for a, b, c and e is 3rd letter - 1st letter - (2nd letter + 1) - 6th letter - 4th letter - (5th letter +1).
In the fourth option, the pattern is 3rd letter - 1st letter - (2nd letter + 1) - 6th letter - 4th letter - (5th letter -1).
Hence, D is the odd one out.
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