Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
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Question: level, tone, fair, impartial, milky

Answer: impartial


Question: egret, crane, goose, dump truck, duck

Answer: dump truck


Question: unflappalbe, mild, ethical, positive, cool

Answer:
mild