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: mode of transportation 
Words: spider, fly, drive, train, soar

Answer: spider


Question: Category: ocean 
Words: current, data sets, main, sea, wave

Answer: data sets


Question: Category: physical property 
Words: large, area, angular momentum, big, fat

Answer:
big