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: elements 
Words: fire, earth, water, blaze, recruit

SOLUTION: recruit

PROBLEM: Category: social gathering 
Words: convention, club, discothek, hamburger, dance hall

SOLUTION: hamburger

PROBLEM: Category: police punishment 
Words: jail, jail time, flyaway, mad, fine

SOLUTION:
mad