Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
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Question: ecstatic, content, disappointed, sad, service

Answer: service


Question: sausage, matter of fact, frank, vittles, grub

Answer: matter of fact


Question: relaxed, warm, unflappalbe, classy, cool

Answer:
warm