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: centimeter, yard, foot, milimeter, head

SOLUTION: head

PROBLEM: deck, board, cards, knockout, draw

SOLUTION: knockout

PROBLEM: exercise, tumble, spring, fall, run

SOLUTION:
spring