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: foot, knee, eye, leg, ounce

Answer: ounce


Question: swallow, heron, crane, flamingo, tackle

Answer: tackle


Question: make the grade, even, fair, color, cool

Answer:
make the grade