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.

[EX Q]: fish, stingray, climbing, trap, hiking
[EX A]: stingray

[EX Q]: ring, deck, pack, box, level
[EX A]: pack

[EX Q]: hardware, sort mail, download, program, file
[EX A]:
sort mail