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: elements 
Words: ground, replace, combustion, flame, fire

SOLUTION: replace

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

SOLUTION: banned

PROBLEM: Category: store status 
Words: close, barred, out of service, near, slow

SOLUTION:
near