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: personal characteristic 
Words: assured, refreshing, unruffled, cool, positive

SOLUTION: refreshing

PROBLEM: Category: animal 
Words: train, fly, jump, leap, grasshopper

SOLUTION: train

PROBLEM: Category: police punishment 
Words: happy, prime, penalty, fine, arrest

SOLUTION:
happy