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: descending, remorseful, down, right, ground

Answer: remorseful


Question: current, wave, whirlpool, sea, data sets

Answer: data sets


Question: house, flat, plain, level, studio

Answer:
plain