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: corporate 
Words: solid, sustainability, streamline, firm, private

SOLUTION: solid

PROBLEM: Category: physical property 
Words: thin, brittleness, heavy, angular momentum, fat

SOLUTION: heavy

PROBLEM: Category: weather 
Words: fair, raining, trustworthy, endure, 70

SOLUTION:
trustworthy