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: military rank 
Words: general, fighter, normal, major, lieutenant

SOLUTION: normal

PROBLEM: Category: animal 
Words: bird, fish, fly, drive, eagle

SOLUTION: drive

PROBLEM: Category: personal characteristic 
Words: cool, relaxed, unruffled, classy, refreshing

SOLUTION:
refreshing