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: emotional status 
Words: board, bored, emotional supports, frustrated, fret

Answer: board


Question: Category: type of sandwich 
Words: club, roll, doorstep, discothek, toast

Answer: discothek


Question: Category: poker 
Words: deck, hearts, fold, knockout, call

Answer:
knockout