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: direction 
Words: down, backward, up, downward, shameful

SOLUTION: shameful

PROBLEM: Category: elements 
Words: ice, fire, burn, let go, combustion

SOLUTION: let go

PROBLEM: Category: card games 
Words: beer, blackjack, canasta, uno, gin

SOLUTION:
beer