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

Answer: picnic


Question: Category: police punishment 
Words: suspension, exquisite, prime, fine, flyaway

Answer: exquisite


Question: Category: aesthetic characteristic 
Words: trustworthy, medium, fair, level, light

Answer:
trustworthy