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: pretty, probation, neat, fine, level

Answer: probation


Question: Category: boats 
Words: lifeline, stern, fold, deck, rudder

Answer: fold


Question: Category: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive

Answer:
refreshing