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: employment activity 
Words: recruit, replace, sack, heat, fire

SOLUTION: heat

PROBLEM: Category: temperature 
Words: cold, hot, cool, popular, relaxing

SOLUTION: popular

PROBLEM: Category: location (proximity) 
Words: beside, nearer, close, locked, nearest

SOLUTION:
locked