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: social gathering 
Words: picnic, french toast, clan, club, bar

SOLUTION: french toast

PROBLEM: Category: elements 
Words: ice, air, fire, hire, combustion

SOLUTION: hire

PROBLEM: Category: aesthetic characteristic 
Words: fair, flaxen, medium, mild, well

SOLUTION:
mild