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: boxing terminology 
Words: ring, lifeline, jab, deck, knockout

Answer: lifeline


Question: Category: boxing terminology 
Words: apron, punch, deck, canvas, call

Answer: call


Question: Category: aesthetic characteristic 
Words: even, brisk, fair, pale, light

Answer:
brisk