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: format, image, fax, file, folder

SOLUTION: fax

PROBLEM: fair, endure, mild, color, tangle

SOLUTION: color

PROBLEM: ant, leap, waggle, bus, fly

SOLUTION:
bus