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: fire, cool, water, ban, ice

SOLUTION: ban

PROBLEM: slow, shut, close, beside, out of service

SOLUTION: beside

PROBLEM: let go, pay, ground, sack, fire

SOLUTION:
ground