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: bike, flap, fly, walk, wave

Answer: walk


Question: tide, belated, signal, current, jetstream

Answer: belated


Question: dump truck, hummingbird, swift, crane, ostrich

Answer:
dump truck