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: submarine, burger, bar, lettuce, club

Answer: bar


Question: Category: police punishment 
Words: probation, jail, arrest, fine, beautiful

Answer: beautiful


Question: Category: guitar part 
Words: emotional supports, fret, truss rod, string, output cord

Answer:
emotional supports