TASK DEFINITION: Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.
PROBLEM: firm, tough, solid, hard, streamline

SOLUTION: streamline

PROBLEM: leverage, solid, firm, amalgamated, concerted

SOLUTION: solid

PROBLEM: raining, brisk, cool, fair, windy

SOLUTION:
cool