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: type of rigidity 
Words: solid, leverage, hard, unbending, firm

SOLUTION: leverage

PROBLEM: Category: type of sandwich 
Words: grilled cheese, french toast, outing, burger, club

SOLUTION: outing

PROBLEM: Category: emotional status 
Words: calm, detached, relaxed, fine, flyaway

SOLUTION:
flyaway