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: geese, crouch, duck, elephant, mallet

Answer: crouch


Question: mallet, goose, geese, hike, duck

Answer: hike


Question: flat, plain, apartment, townhome, squashed

Answer:
plain