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: bird 
Words: hummingbird, tackle, crane, hoist, tackle

SOLUTION: tackle

PROBLEM: Category: secretary duty 
Words: support, fax, file, download, errands

SOLUTION: download

PROBLEM: Category: emotional status 
Words: fine, ok, happy, decent, prison

SOLUTION:
prison