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: melancholy, descending, emotionalities, emotional, down

Answer: descending


Question: emotional state, opposite of up, unhappy, down, miserable

Answer: opposite of up


Question: hull, deck, rudder, check, lifeline

Answer:
check