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: fine, prime, firstrate, comfortable, ticket

Answer: comfortable


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

Answer: make the grade


Question: Category: chocolate food 
Words: pudding, cake, pie, fudge, invent

Answer:
invent