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: consumer product 
Words: shop, tools, happy, service, content

SOLUTION: happy

PROBLEM: Category: physical activity 
Words: sprint, cow, duck, jog, squat

SOLUTION: cow

PROBLEM: Category: corporate 
Words: united, hard, ceo, shareholders, firm

SOLUTION:
hard