TASK DEFINITION: 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.
PROBLEM: nervous, frustrated, fret, jack, concerned

SOLUTION: jack

PROBLEM: dog, push, duck, squat, jog

SOLUTION: dog

PROBLEM: squashed, even, plane, hill, flat

SOLUTION:
squashed