Explanation
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$$\textbf{Step 1: Find the odd one out.}$$
$$\text{Option A, B, D consist of two alternate letters in forwarding order.}$$
$$\text{But the group in option D has two alternate letters in reverse order.}$$
$$\text{So, option D is the odd one among the given options.}$$
$$\textbf{Hence, option D is correct.}$$
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