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: poker 
Words: board, joker, deck, fold, apron

SOLUTION: apron

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

SOLUTION: cow

PROBLEM: Category: elements 
Words: fire, burn, flame, sack, air

SOLUTION:
sack