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: geographical property 
Words: horizontal, hotel, flat, lined, smooth

Answer: hotel


Question: Category: computers 
Words: hardware, sort mail, download, program, file

Answer: sort mail


Question: Category: computers 
Words: file, text, ram, download, fax

Answer:
fax