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

Answer: beautiful


Question: Category: moral characteristic 
Words: just, make the grade, well, unjust, fair

Answer: make the grade


Question: Category: window material 
Words: glass, acrylic, wood, metal, plate

Answer:
plate