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: hoist, neck, concrete pourer, hummingbird, crane

Answer: concrete pourer


Question: sergeant, general, standard, plain, ordinary

Answer: sergeant


Question: let go, air, combustion, fire, earth

Answer:
let go