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: type of sandwich 
Words: submarine, burger, bar, lettuce, club

SOLUTION: bar

PROBLEM: Category: geographical property 
Words: paved, even, hill, level, flat

SOLUTION: even

PROBLEM: Category: physical activity 
Words: run, stoop, spring, fall, roll

SOLUTION:
spring