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: outdoor sport activity 
Words: swim, wrestle, fish, canyoning, horse

SOLUTION: horse

PROBLEM: Category: physical activity 
Words: sprint, get down, cow, duck, bow

SOLUTION: cow

PROBLEM: Category: physical activity 
Words: leaves, swim, trip, fall, exercise

SOLUTION:
leaves