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: secretary duty 
Words: file, errands, type, folder, order office supplies

SOLUTION: folder

PROBLEM: Category: physical activity 
Words: trip, jump, fall, equinox, exercise

SOLUTION: equinox

PROBLEM: Category: body part 
Words: foot, pound, eye, heel, elbow

SOLUTION:
pound