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: unflappalbe, refreshing, funny, cool, confident

Answer: refreshing


Question: shareholders, alignment, firm, sustainability, solid

Answer: solid


Question: sandpiper, crane, hummingbird, neck, digger

Answer:
digger