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: open-faced, hero, club, discothek, hamburger

SOLUTION: discothek

PROBLEM: Category: temperature 
Words: cold, cool, icy, assured, mild

SOLUTION: assured

PROBLEM: Category: boxing terminology 
Words: pack, ring, deck, box, glove

SOLUTION:
pack