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: motherboard, folder, hardware, file, schedule appointments

A: schedule appointments
****
Q: summer, roll, plummet, fall, exercise

A: summer
****
Q: level, probation, prison, fine, custody

A:
level
****