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: duplex, studio, flat, paved, squashed

A: paved
****
Q: forward, opposite of up, unhappy, downward, down

A: unhappy
****
Q: folder, image, file, prepare, keys

A:
prepare
****