Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
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Question: Category: aesthetic characteristic 
Words: well, milky, variety, tone, fair

Answer: well


Question: Category: type of sandwich 
Words: picnic, open-faced, club, grilled cheese, lettuce

Answer: picnic


Question: Category: personal characteristic 
Words: chill, cool, persistent, relaxed, funny

Answer:
chill