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: bird 
Words: digger, heron, crane, mallet, sandpiper

Answer: digger


Question: Category: aesthetic characteristic 
Words: there, ticket, fine, dull, level

Answer: ticket


Question: Category: bird 
Words: crane, neck, digger, swift, winch

Answer:
digger