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: group, clan, hamburger, club, bar

Answer: hamburger


Question: stern, frank, weenie, brash, matter of fact

Answer: weenie


Question: cold, plummet, fall, roll, plunge

Answer:
cold