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]: concerned, fret, notes, frustrated, worried
[EX A]: notes

[EX Q]: air, fire, hire, ban, promote
[EX A]: air

[EX Q]: touching, closest, bordering, shut down, close
[EX A]:
shut down