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: poker 
Words: fold, suits, deck, sail, hearts

Answer: sail


Question: Category: emotional display 
Words: buck, identity, culture, fawn, pester

Answer: buck


Question: Category: corporate 
Words: corporation, leverage, firm, amalgamated, unyielding

Answer:
unyielding