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: animal 
Words: fish, bat, sea turtle, trap, goat

SOLUTION: trap

PROBLEM: Category: poker 
Words: punch, pack, deck, check, fold

SOLUTION: punch

PROBLEM: Category: computers 
Words: keys, image, fax, file, firewall

SOLUTION:
fax