Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

[Q]: format, image, fax, file, folder
[A]: fax


[Q]: forward, opposite of up, unhappy, downward, down
[A]: unhappy


[Q]: joker, knockout, deck, blind, chips
[A]:
knockout