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: rudder, bow, pack, crew, deck

SOLUTION: pack

PROBLEM: fly, swim, car, beetle, grasshopper

SOLUTION: car

PROBLEM: tough, common, firm, alignment, combined

SOLUTION:
tough