TASK DEFINITION: Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.
PROBLEM: Category: boxing terminology 
Words: ring, lifeline, jab, deck, knockout

SOLUTION: lifeline

PROBLEM: Category: chocolate food 
Words: brownie, cake, fudge, banned, molasses

SOLUTION: banned

PROBLEM: Category: mode of transportation 
Words: fly, swim, bus, grasshopper, train

SOLUTION:
grasshopper