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: medium, just, light, ghostly, fair

Answer: just


Question: Category: secretary duty 
Words: file, errands, type, folder, order office supplies

Answer: folder


Question: Category: police punishment 
Words: prison, fine, flyaway, hot, firstrate

Answer:
hot