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: temperature 
Words: cold, hot, cool, popular, relaxing

SOLUTION: popular

PROBLEM: Category: mode of transportation 
Words: train, spider, wave, fly, drive

SOLUTION: spider

PROBLEM: Category: police punishment 
Words: fine, prime, firstrate, custody, ok

SOLUTION:
ok